BDL-BG-R2-EU-SR-EN Bluetooth Smart Door Lock by MOES with built-in battery micromotor, has AES128 Bit encryption and bank level TLS. It locks or unlocks the door without the use of hands or a key with a tap on our mobile screen. Available on its own or bundled with a Bluetooth keyboard. Remote management capability, (Lock/Unlock), via Smart Life/Tuya Smart app, by connecting the lock to WiFi via the Bluetooth gateway, which is included in the package. Option to automatically unlock via Bluetooth sensor when approaching the door, providing time-limited access via app or code, (keyboard required for code, sold separately) . Works with 4xAA Batteries.