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LinkU S819-2MAX Smart Door Lock Code Finger 3D Cam Key RFID Mobile App Video Door Bell Mode
Model : Fingerprint Smart Lock
Material: Aluminum alloy + Tempered glass
Power Supply: 4/8 *AA Alkaline Battery
Size: 75*375mm
Color: Black
G.Weight: 5kg/set , 6 set/ctn, 25kg, 46.5*44*48.5 cm
Door thickness: 40-120mm
Unlock: Tuya APP & Password &video call& Fingerprint & card & key
Standard Mortise: 6068*24*240mm
Material: Aluminum alloy + Tempered glass front panel
Power Supply: 4 to 8 AA Alkaline batteries (battery-powered)
Dimensions / Size: 75 × 375 mm total body size
Color: Black
Door Thickness Supported: 40 – 120 mm
Net Weight: ~5 kg / set
Standard Mortise (Lock Body): 60 × 68 × 24 × 240 mm
🔓 Unlocking Methods
supports multiple secure unlocking options:
Fingerprint recognition
Password / PIN code
RFID card
Mechanical key
Mobile App (Tuya / smart control)
Video call mode (doorbell + remote open feature)
If the battery of the LinkU smart lock suddenly dies, you still have a few ways to get the door open
🔑 1. Use the Mechanical Key (Backup Key)
a traditional mechanical key override.
🔹 You insert the physical key into the hidden keyhole and turn it to unlock the door manually.
👉 This is the standard manual backup for when batteries are dead.
Tuya Support
Make sure:
The mechanical key is kept somewhere safe but accessible (on your keyring or in a trusted spot).
You know where the keyhole is (often under a cover flap or panel on the lock).
🔌 2. Emergency Power Supply
📶 Smart & Connectivity Features
Wi-Fi Built-in: Connects to home network for remote control via app
Tuya Smart (or compatible) App: Manage access, see history, send guest codes remotely
HD Camera + Video Calling / Intercom: Enables real-time visitor verification and remote unlocking
Qleung Lock
Cloud & Local Storage: Logs and credentials may be stored in cloud or locally depending on firmware/app version
📱 Smart Features
Works with mobile app control – likely via Tuya/Smart Life ecosystem
Video doorbell & call mode for remote visitor verification and unlocking
IP / Weather Resistance: Some listings mention IP65 water & dust resistance, making it suitable for exterior doors (confirm with seller)
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