Product features Bluetooth sensing technology, which can automatically open the door and automatically lock after leaving. Once the phone is set up, you can share permissions to other phones. Freely switch between "electronic lock mode" and "manual mode". Fire protection Operating Steps: Download the app and connect to the Bluetooth Set the left and right door opening directions Set the door knob to lock the rotation position Set the automatic lock time Specification: 153(L) x60(W)x60.8(H)mm Zinc die + PC / ABS + POM plastic steel Suitable for door thickness 40~50mm Battery: CR123A, 1500mAh <Previous Next>