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 V6: the security-first smart lock with camera and dual battery
The Interlock Mercury V6 is a smart door lock with a built-in camera, infrared night vision, 3D binocular face recognition, palm vein access and a dual battery that keeps the lock running while one battery charges. It's built for homeowners who want to know what's happening at their door, with free installation.
Picture this. It's 2am and your phone buzzes. Someone has been lingering at your door for a while. You open live view in the app and, thanks to infrared night vision, see the corridor clearly even with the lights off. Before the V6, you'd never have known.
Digital lock with camera and night vision
The V6's 3D binocular face recognition uses two lenses to read depth, so it unlocks for a real face and not a photo. The same camera, with a 135° wide-angle view and infrared night vision, lets you see who's at the door, day or night. Open live view in the app anytime, from anywhere.
Inside, a 4.5 inch display shows your visitor, with a two-way audio intercom. Video is one-way, so they can't see in. When you're out, answer from the app.
7 ways in: 3D face, palm vein, fingerprint, PIN, card, the Tuya Smart app and a mechanical key.
Real-time alerts when something isn't right
You rushed out for school drop-off and aren't sure you shut the door properly. The V6 tells you. It sends real-time alerts for:
- a door left open or not properly closed
- someone lingering at your door
- anyone trying to pry the lock
- low battery and system issues
Stay-Snap automatically takes a photo of any unauthorised entry attempt. A snoop-proof virtual PIN lets you add random digits around your real code, so anyone watching over your shoulder can't learn it. A separate duress code opens the door normally while quietly flagging an alert in the app, for the rare moment someone forces you to let them in.
Dual battery: what if the battery runs out?
The V6 runs on two rechargeable lithium batteries side by side. Take one out to charge and the other keeps the lock working, so the lock never goes dark while you charge.
- Up to 4 months per charge. A monthly top-up is a good habit, but it isn't a must.
- Low battery alerts on the lock and your phone.
- USB-C emergency power from any phone power bank.
- Mechanical key backup for the rare day electronics aren't the answer.
Ask us about the V6 on WhatsApp
Smart lock for HDB, condo and landed doors, installed free
The V6 suits a wide range of door thicknesses, from 40mm to 120mm, so it's a good option for thicker condo and landed doors. Not sure it fits? Send us photos of your door 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 V6 installs by our team
From condos like Reflections and Mi Casa, including homes that replaced an old SimonsVoss lock.
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 V6 comes with a 1 year onsite warranty, and the people who installed it are the people you call.
Interlock Mercury V6 review: what to know before you buy
What owners love
- Live view anytime, with night vision and a 135° view
- Real-time alerts for open doors, lingering and tampering
- Dual battery, so the lock never goes dark while charging
Good to know before you buy
- The V6 doesn't sync with Mercury gate locks. For door and gate sync, choose the X6 or X5
- Face and palm vein share up to 100 profiles, and PINs and cards share up to 100
- It needs a dedicated 2.4GHz Wi-Fi network with its own name (SSID). 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
- Your door must meet the fit requirements, so send us photos first
Want door and gate sync instead? See the Mercury X6. Still deciding? Compare every Mercury model side by side.
Know what's happening at your door, even when you're not there.
Send us your door 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.
Door Gap
Gap Requirement: 3-8mm
Door Thickness
Recommended door thickness: 40–60mm
Distance between Door Edge to Internal Handlebar (if there is a handlebar)
Minimum Required Distance: >110mm
Distance Between Door & Gate
Minimum Distance Required: >60mm
Real installation photos from our customers.
| Model | Interlock Mercury V6 |
|---|---|
| Lock Type | Mortise (Electronic Mortise with accurate door status detection) |
| Unlocking Methods | Palm Vein, Facial Recognition, Password, Fingerprint, Manual Key, App/Bluetooth, Card/Tag |
| Connectivity | Built-in Wi-Fi (2.4GHz only, Tuya Smart App); video intercom and live view anytime from the app |
| Power Source | Dual 7.4V rechargeable lithium batteries (redundant power - lock keeps running if one battery is depleted/charging); 5V/2A USB Type-C emergency power |
| Battery Life | Up to 4 months under typical use; we recommend recharging monthly |
| Warranty | 1 year (onsite, product & battery warranty) |
| Material | ABS |
| Dimensions | Front Panel (camera side): 68mm (W) x 405mm (H) x 50mm (D); Rear Panel: 72mm (W) x 430mm (H) x 58mm (D) |
| Applicable Door Thickness | 40mm - 120mm |
| Internal Display | 4.5-inch screen with video intercom support |
| Fingerprint Capacity | Up to 100 |
| Card + PIN Code Capacity | Up to 100 (combined) |
| Facial ID + Palm Vein Capacity | Up to 100 (combined) |
| Fingerprint Sensor Resolution | 500 DPI |
| Operating Temperature | -20C to 60C (-4F to 140F) |
| Door Lock Status Alerts | Door-open reminder, low battery reminder, door-not-closed abnormal reminder, abnormal hovering alarm, anti-prying prompt alarm |
| Security Features | Anti-hijack duress user support, power-on self test, anti-peep virtual password protection, infrared night vision |
| 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 V6 comes with a 1 year onsite warranty, so the people who installed it are the people you call.
Choose the V6 if security alerts matter most: night vision camera, alerts for open doors and lingering, a duress code and a dual battery. Choose the X6 if you also have a gate, because the X6 syncs with Mercury G3 and G4 gate locks so both unlock together. The V6 does not support gate sync.
The Interlock Mercury V6 is best suited for homeowners who want a smart digital door lock with 3D face recognition, palm vein recognition, built-in camera viewing, video intercom, real-time alerts, and a dual-battery design. It is suitable for HDB, condominium, landed homes, and rental units where the door meets the required installation conditions.
The Mercury V6 combines 3D binocular face recognition, palm vein recognition, fingerprint access, PIN code, card access, app control, a 4.5-inch indoor display, HD door viewer, infrared night vision, and dual lithium batteries. It is designed for homeowners who want advanced smart access with stronger power redundancy.
The Mercury V6 uses a dual lithium battery design for extended runtime and better power redundancy. This helps the lock continue operating with fewer interruptions compared to a single-battery setup.
Dual battery is useful because it gives the lock a stronger power backup system for daily use. It reduces the chance of sudden downtime and gives homeowners more flexibility when one battery needs charging.
Yes. The Mercury V6 supports 3D binocular face recognition, allowing users to unlock hands-free without needing to use fingerprint, PIN code, card, or app access.
The Mercury V6 uses 3D facial mapping and live liveness detection to help prevent unlocking with photos, videos, or static images.
Yes. The Mercury V6 supports palm vein recognition as one of its biometric access methods. This gives users a contactless unlocking option that can be useful when fingerprint recognition is less convenient.
Yes. The Mercury V6 can be suitable for children and elderly users because it supports multiple access methods, including facial recognition, palm vein recognition, fingerprint, PIN code, card, app unlock, and mechanical key. Its face recognition is designed to work for users from about 1.0m to 2.0m in height.
The Mercury V6 supports facial recognition, palm vein recognition, fingerprint, PIN code, card or tag, Tuya Smart Home app access, one-time or periodic PIN codes, and mechanical key access.
Yes. The Mercury V6 supports remote unlocking through the Tuya Smart Life app when the lock is connected to WiFi. This allows you to unlock and manage access through your smartphone.
Yes. The Mercury V6 supports one-time and periodic PIN codes depending on app configuration. This is useful for trusted visitors, helpers, family members, or short-term access needs.
Yes. The Mercury V6 records unlock logs such as time, access method, and user identity where configured. These can be reviewed through the Smart Life app, with export options depending on the app’s supported functions.
The Mercury V6 works with the Tuya Smart Life app on iOS and Android. The app supports functions such as remote unlocking, real-time alerts, user management, access logs, and selected remote monitoring features.
Yes. The Mercury V6 has a built-in HD door viewer with a 4.5-inch indoor display, allowing you to view visitors clearly from inside the home.
Yes. The Mercury V6 supports a two-way audio intercom with one-way video to your smartphone, so you can see and speak with visitors before deciding whether to unlock the door. You can also open live view in the app anytime. Visitors can't see into your home.
Yes. The Mercury V6 supports infrared night vision, helping you view visitors more clearly even in dark or low-light conditions.
The 135° wide-angle camera gives a wider view of the door area, helping you see visitors and nearby activity more clearly before unlocking.
Yes. The Mercury V6 includes visitor alert functions through its door viewer and app system. App notifications depend on the lock’s WiFi connection and app configuration.
Yes. The Mercury V6 supports real-time push alerts for selected events such as low battery, break-in attempts, and system anomalies depending on the app configuration.
The Stay-Snap function captures images of unauthorized entry attempts or selected security events, helping homeowners review suspicious activity around the door.
Yes. The Mercury V6 supports snoop-proof virtual password entry, which allows you to enter extra digits before or after the correct PIN to reduce the risk of someone seeing your actual passcode.
Basic lock functions do not require a paid cloud video subscription. The Mercury V6 includes a complimentary cloud storage trial for video recordings. After the trial, continued cloud video storage is optional and may require a subscription through the app provider.
Yes. The Mercury V6 includes cloud image storage for the latest 14 days at no extra charge. Photos are stored on a rolling basis and automatically deleted after the supported storage period.
The Mercury V6 includes a complimentary trial for cloud video recordings. After the trial, continued cloud video storage may require a subscription, but videos and photos can still be stored locally where supported.
If the battery is depleted, you can temporarily power the Mercury V6 using a USB-C power bank through the emergency charging port. You can also use the included mechanical backup key to unlock the door.
Yes. The Mercury V6 has an emergency USB-C charging port. If the battery is depleted, you can connect a portable power bank temporarily to power the lock and unlock the door.
The Mercury V6 needs a dedicated 2.4 GHz WiFi network with its own name (unique SSID). If your router combines 2.4 GHz and 5 GHz under one network name, set up a separate 2.4 GHz network before installation, as combined networks may not pair. Note: Some WiFi 7 routers have trouble pairing with smart locks, so a compatible 2.4 GHz network may be needed.
Yes. WiFi is mainly needed for remote app features. If WiFi is down, you can still unlock using non-app methods such as facial recognition, palm vein recognition, fingerprint, PIN code, card, or mechanical key.
Yes. The Mercury V6 can be suitable for HDB doors when the door meets the required thickness, door gap, clearance, and installation conditions. A compatibility check is recommended before purchase.
Yes. The Mercury V6 can be suitable for condominium and landed property doors, depending on door thickness, frame alignment, door gap, existing lock position, and door-to-gate clearance.
The recommended door thickness for the Mercury V6 is 40mm to 60mm. Final compatibility still depends on the actual door condition, existing lock position, and installation area.
The recommended door gap for the Mercury V6 is 3mm to 8mm. If the gap is too narrow or too wide, installation suitability may be affected.
The Mercury V6 requires more than 60mm distance between the door and gate. This helps ensure the lock has enough clearance and does not clash with the gate when the door is closed.
The Mercury V6 requires more than 110mm distance between the door edge and the internal handlebar if there is one. If the handlebar is too close to the lock area, installation may not be suitable.
No. The Mercury V6 is designed for wooden or solid core doors. For metal gates, glass doors, or sliding doors, a dedicated gate, glass, or sliding lock model would be more suitable.
Not every wooden door is suitable. Compatibility depends on door thickness, door gap, lock area, frame alignment, existing lock position, internal handlebar clearance, and door-to-gate distance. Our team will check your photos before confirming suitability.
You should send clear photos of the front and back of your door, the side of the door, the current lock area, the door frame, and a photo showing the door and gate closed together if you have a gate. If there is an internal handlebar, include a photo showing the distance from the door edge to the handlebar.
Yes. Complimentary installation is included for the Mercury V6. Before installation is confirmed, our team will still need to check your door photos to make sure your door thickness, door gap, frame alignment, internal handlebar clearance, and door-to-gate distance are suitable.
The Mercury V6 comes with 1 year warranty. Warranty coverage may depend on usage conditions, installation conditions, and whether the lock is used within the recommended environment.