Features:*No lock hole design, it completely abandons the traditional key and lock, open and close by remote control or APP (Tuya / SmartLife), realized real security.*Three unlock modes optional: Phone APP unlock, Remote control unlock, indoor Button unlock.* Dual core and dual system, open faster, response quicker. Easy and firm installation with the external mounting plate.* Remote controls with digital conversation system, it cannot be decoded or duplicated. Anti-theft and bring you safety.* Made of stainless steel, provide long service life, very strong and steady. Power saving and low battery consumption.* Once the main batteries are depleted, you can use the backup battery, no worries about dead battery and be locked outside.* Ideal for office, home, hotel, anti-theft door, corridor door, wooden doors, garage door, etc.