Note: Product visuals are presented for illustrative purposes only and may vary slightly in colour, finish, proportions, and final installed appearance. For the most realistic representation, please refer to our Customer Gallery featuring actual installation photos.
Interlock Mercury G3: Singapore's first dual camera digital gate lock
The Interlock Mercury G3 is a digital gate lock with camera, built for HDB and condo metal gates. Two cameras show both the visitor's face and the parcel at their feet, and it unlocks by face, palm vein, fingerprint, PIN, card, remote or app, with free installation.
Picture this. Your phone says your parcel was delivered at 2:14pm, and you're still at work. Is it actually at your gate, or at the wrong unit? A normal gate camera only shows faces, not the floor. With the G3, you open the second camera's live view and see the box sitting right there.
Gate lock with camera: see the visitor and the parcel
The G3's upper camera sits at eye level to show who's at your gate, and it handles motion alerts, so you know the moment someone walks up. The second camera points at the floor, where parcels actually get left. Wondering if your parcel is still there? Open its live view in the app and check in seconds.
Talk to visitors through the intercom before deciding whether to open up. Snapshots are saved free for 14 days.
Face recognition gate lock with PINs that expire on their own
Your weekly cleaner comes every Thursday morning. Instead of handing over a key, give them a scheduled PIN that only works during those hours. The plumber coming tomorrow gets a one-time PIN that stops working after it's used once.
The family uses face or palm vein recognition, so nobody fumbles at the gate with bags in hand. An anti-peep virtual PIN lets you add random digits around your real code, and tamper detection flags anyone trying to force the lock.
Door and gate unlock together
Pair the G3 with a Mercury X2, X5 or X6 door lock and both can be set to unlock together. One scan at the gate and you're through both. Buying both? See the Mercury door and gate bundle.
What if the battery runs out?
- Rechargeable battery. Usually 2 to 4 months per charge, depending on use. A monthly top-up is a good habit, but it isn't a must. Charge with the cable provided and a standard 5V/2A adaptor, not a fast charger.
- Low battery alerts warn you before it runs flat.
- USB-C emergency power from any phone power bank.
- Mechanical keys and a remote control are included.
If Wi-Fi goes down, every unlock method still works. Only the app, cameras and alerts pause.
Ask us about the G3 on WhatsApp
Digital gate lock for HDB and condo gates, installed free
The G3 is designed for Singapore's metal gates. The camera and app need a 2.4GHz Wi-Fi signal at the gate, which we'll check with you first.
Not sure it fits? Send us photos of your gate on WhatsApp for a free Fit Check before you buy. Installation is included. If the lock can't be properly installed and we can't offer a suitable alternative, you won't be charged for the installation.
Real G3 installs by our team
Installed on HDB gates in Dakota and Punggol.
More photos in the Customer Gallery tab.
A Singapore lock brand that won't disappear on you
Mercury is Interlock's own range, installed and serviced by our in-house team, the same team that has been fitting Singapore homes since 2008. Your Mercury G3 comes with a 1 year onsite warranty, and the people who installed it are the people you call.
Interlock Mercury G3 review: what to know before you buy
What owners love
- Two cameras that cover the visitor and the parcel
- Face and palm vein unlock at the gate
Good to know before you buy
- Motion alerts come from the upper camera. The parcel camera is for live view
- The cameras are for checking visitors and parcels, not a replacement for full CCTV. Video can occasionally lag depending on your Wi-Fi
- It needs a dedicated 2.4GHz Wi-Fi network with its own name (SSID), with signal reaching the gate. Combined 2.4GHz/5GHz networks may not pair
- Some Wi-Fi 7 routers have trouble pairing with smart locks, so a compatible 2.4GHz network may be needed
- Snapshots are saved free for 14 days. Cloud video needs a subscription after the free trial
- The battery usually lasts 2 to 4 months. Charge it with a standard 5V/2A adaptor, not a fast charger
- Best for sheltered gates, so ask us if yours is exposed to heavy rain
Want a key on both sides of the gate and more user storage? See the Mercury G4. Still deciding? Compare every Mercury model side by side.
Know who came to your gate, and what they left.
Send us your gate photos and we'll confirm the fit and your installed price.
Please check the following requirements before purchase. If unsure, send us your door and gate photos on WhatsApp and our team will confirm compatibility before installation.
Gate Gap
Gap Requirement: 4-8mm
Gate Thickness
Recommended Gate thickness: 25-40mm
Distance Between Door & Gate
Minimum Distance Required: >40mm
Real installation photos from our customers.
| Model | Interlock Mercury G3 |
|---|---|
| Lock Type | Rim (Gate Lock, Dual Camera) |
| Unlocking Methods | Face Recognition, Palm Vein, Fingerprint, Passcode, IC Card, Remote Control, Mechanical Key, Tuya Wi-Fi/App |
| Connectivity | Built-in Wi-Fi (2.4GHz only, Tuya Smart App) |
| Power Source | 4200mAh, 7.4V rechargeable lithium battery; 5V/2A USB Type-C emergency power |
| Battery Life | Up to 3 months under typical use; we recommend recharging monthly |
| Warranty | 1 year (onsite, product & battery warranty) |
| Dimensions | Front Panel: 75mm (W) x 192mm (H); Side Depth: 22mm; Lock Catch: 33mm (W) x 142mm (H); Rear Panel: 75mm (W) x 233mm (H) x 33mm (D) |
| Voice Languages | English, Chinese |
| Face Capacity | Up to 50 |
| Palm Vein Capacity | Up to 50 |
| Fingerprint Capacity | Up to 100 |
| Passcode Capacity | Up to 100 groups |
| IC Card Capacity | Up to 100 cards |
| Anti-Peep Virtual PIN | Up to 16 digits |
| Low-Battery Alarm | Triggers at 4.8V +/- 0.2V |
| Standby Current (Main Body) | <= 350uA |
| Standby Current (Exterior Camera Unit) | < 250mA |
| Operating Temperature | -25C ~ 70C |
| Operating Humidity | 20% ~ 90% RH |
| Camera System | Dual camera - upper camera for eye-level visitor verification, lower camera for floor-area/parcel monitoring |
| Dual Sync | Compatible with paired Mercury door lock for synchronized entry |
| Cloud Storage | Complimentary video cloud storage trial; photos free (rolling 14-day); local storage also supported without subscription |
Frequently Asked Questions
Have questions? We're here to help you.
Mercury is Interlock's own range of digital locks. It is installed and serviced by our in-house team, the same team that has been fitting Singapore homes since 2008. Your G3 comes with a 1 year onsite warranty, so the people who installed it are the people you call.
Choose the G3 if seeing parcels matters to you: its two cameras cover both the visitor and the floor. Choose the G4 if you want DualKey, a mechanical key on both the inside and outside of the gate, plus room for up to 200 fingerprints and 1,000 PINs, cards and remotes. Both sync with Mercury door locks.
The Interlock Mercury G3 is best suited for homeowners who want a smart gate lock with advanced unlocking methods, stronger gate visibility, visitor awareness, parcel monitoring, and remote app access. It is designed for Singapore metal gate setups, including common HDB, condominium gates.
The Mercury G3 is Singapore's first dual camera smart gate lock. The upper camera shows visitors and sends motion alerts, and the lower camera lets you check the floor for parcels through live view. Most gate locks with a camera only show faces.
The upper camera shows visitors at face level and handles motion alerts, so you know when someone approaches. The lower camera points at the floor, so you can open its live view in the app to check whether a parcel is still at your gate.
Yes. The Mercury G3 supports app-based live viewing, allowing you to check visitors remotely through your smartphone when the lock is connected to a stable WiFi network.
Yes. Open the lower camera's live view in the app to see whether a parcel is still at your gate. The lower camera is for live viewing only. Motion alerts come from the upper camera, so you'll already know when someone has come by.
The Mercury G3 is secondarily designed for convenient visitor viewing, video intercom use, and supplementary gate-area monitoring. It is not intended to replace a dedicated CCTV system, and its frame rate may be lower with an occasional short delay. You can ask us to provide an actual video sample before confirmation so that you can understand the expected viewing quality comfortably.
As the camera is built directly into the digital gate lock, it is designed mainly for convenient visitor viewing and supplementary monitoring rather than continuous CCTV-style recording. A short delay or lower frame rate may occasionally occur, and the viewing experience can also be affected by the home WiFi environment.
Yes. The Mercury G3 supports facial recognition unlocking, allowing authorised users to unlock the gate hands-free without relying only on fingerprint, PIN code, card, or app access.
Yes. The Mercury G3 supports palm vein recognition as one of its biometric access methods. This provides a convenient contactless alternative for users who may not always get consistent fingerprint recognition.
From outside the gate, the Mercury G3 supports fingerprint, passcode, NFC card or tag, facial recognition, palm vein recognition, and remote unlocking through the app when the lock is connected to WiFi.
From inside the gate, the Mercury G3 supports fingerprint unlocking, mechanical key access, and remote keyfob controller unlocking.
Yes. When the Mercury G3 is connected to WiFi and online, authorised administrators can unlock and manage access remotely through the mobile app.
Yes. When connected to WiFi, the Mercury G3 supports remote unlocking through the app. This can be useful for trusted family members, helpers, or visitors. For security, you should always confirm who is at the gate before unlocking it remotely.
The Mercury G3 requires a dedicated 2.4 GHz WiFi network with a unique SSID for its app, camera, notification, and remote functions. If your router combines 2.4 GHz and 5 GHz under one network name, set up a separate 2.4 GHz network, as combined networks may not pair. A dedicated 2.4 GHz connection should be available near the gate before installation. Note: Some WiFi 7 routers have trouble pairing with smart locks, so a compatible 2.4 GHz network may be needed.
For better connection stability, position the router reasonably near the gate and keep a clearer path between the router and lock where possible. If adjustments are required, using a 20 MHz channel width and fixing the 2.4 GHz WiFi channel to 1, 6, or 11 may help improve stability.
WiFi performance can vary between homes because it depends on the router, distance, home layout, metal obstruction, nearby devices, and wireless interference. Most customers can use the connected functions smoothly with the correct setup, but performance may differ slightly between households.
Yes. WiFi is mainly required for remote app, camera, and notification functions. If WiFi is temporarily unavailable, you can still unlock the gate using facial recognition, palm vein recognition, fingerprint, PIN code, NFC card or tag, remote controller, or mechanical key access where applicable.
Yes. The Mercury G3 supports mobile notifications for selected gate activity, visitors, motion detection, and access events, depending on the app settings and WiFi connection.
Yes. The Mercury G3 supports activity logging, allowing you to review access records and selected monitoring history. Properly binding each locally registered lock user to the relevant household member in the app can also help make the activity records easier to identify.
Yes. The Mercury G3 includes tamper detection features designed to alert homeowners to unusual activity or possible forced interference around the gate lock.
The basic lock and unlocking functions do not require a paid cloud video subscription. The Mercury G3 includes a complimentary cloud storage trial for video recordings, and continued cloud video storage may require an optional subscription after the trial. Photo cloud storage and supported local storage options may still be available depending on the app configuration.
The Mercury G3 includes a complimentary trial for cloud video recording. After the trial, continued cloud video storage may require a subscription. Supported local storage options may also allow selected videos or photos to be stored without a paid cloud plan.
Yes. The Mercury G3 supports cloud image storage for recent snapshots at no additional charge, depending on the supported app setup. Images may be stored on a rolling basis and automatically removed after the applicable storage period.
One full charge can generally last approximately two to four months, depending on household size, unlocking frequency, camera usage, motion activity, and WiFi usage. For better long-term battery health, we recommend charging it once a month, especially for larger households or higher-usage homes.
Please charge the battery using the USB-A to USB-C cable provided by Interlock together with a standard 5V/2A USB-A adaptor. A lower-current 5V adaptor can also be used, although charging may take longer. A full charge usually takes approximately four to six hours.
No. Quick-charge, fast-charge, Power Delivery, 9V, or 12V charging adaptors should not be used. These chargers may affect the battery-level reading, shorten the battery lifespan, or damage the battery. Battery damage caused by an unsuitable charging method is not covered under warranty.
The Mercury G3 provides low-battery alerts and an emergency power port. If the battery is fully depleted, you can temporarily power the lock using a portable 5V/2A power bank to regain access. The battery should then be fully recharged using the recommended charging method.
Yes. If the lock battery is depleted, you can use the emergency power port with a portable power bank for temporary activation. This is intended for emergency access rather than regular charging.
Yes. Multiple household members can be registered with their own fingerprint, face recognition, palm recognition, PIN, or card access, subject to the supported user capacity.
For the most reliable setup, register each fingerprint, face, palm, PIN, or card directly through the lock first. The locally registered lock user can then be bound to the correct household member in the Tuya app.
The app includes a remote registration function, but this function is currently still being improved and may not complete consistently in every attempt. For the most reliable setup and clearer activity records, we recommend registering each access method directly through the lock before binding the user in the app.
Yes. The Mercury G3 is designed for common Singapore metal gate setups, including many HDB gates. However, compatibility still depends on the actual gate design, available lock area, gate gap, and installation clearance.
Yes. The Mercury G3 can be suitable for condominium metal gates, depending on the gate structure and available installation space. A compatibility assessment should be completed before purchase.
Not every metal gate will be suitable. Some gates may have limited lock space, narrow gate-to-door clearance, unusual frame designs, existing lock holes, or other installation restrictions. A photo-based compatibility assessment is required before confirming installation.
Please send clear photos showing the front and back of the gate, the existing lock area, the gate frame, and the door and gate closed together. If possible, also provide the gate-to-door distance so that our team can assess the available installation clearance.
Yes. The Mercury G3 can be suitable for elderly users because it provides several access methods, including facial recognition, palm vein recognition, fingerprint, card or tag, PIN code, remote controller, and mechanical key access. This gives each household member the flexibility to use the method that is most comfortable for them.
Yes. Children can use suitable access methods such as card or tag, PIN code, fingerprint, or palm vein recognition depending on their height, habits, and family preference. For younger children, parents may prefer simpler methods such as tags or PIN codes.
Yes. The Mercury G3 includes mechanical keys for internal emergency unlocking.
Yes. The Mercury G3 includes access tags that can be registered for convenient unlocking by household members.
Yes. The Mercury G3 includes a remote controller, which can be used as one of the unlocking methods from inside the home.
The Mercury G3 is designed for suitable Singapore gate environments, but it should still be protected from direct heavy rain exposure where possible. For unsheltered or highly exposed gates, please check the installation suitability before purchase.
The Mercury G3 comes with a 1-year local warranty. Warranty coverage is subject to the recommended usage, charging, installation, and environmental conditions.
Yes. Complimentary installation is included for the Mercury G3. Before installation is confirmed, we will need to assess your gate photos to ensure that the gate design, available lock area, gate gap, and door-to-gate clearance are suitable.