Support long range detection. It fits 99% of door, drawer, mechanical automatic rebound, and the detection distance is approx. 40-60mm/1.6-2.4in Supports long-range detection. It fits 99% of door, drawer, mechanical automatic rebound, and the detection distance is approx. 40-60mm/1.6-2.4inch Temporary/permanent/one-time/loop unlock code can be sent remotely without worrying about opening the door even when you are away. Support emergency external power supply in case of battery failure. You can unlock with emergency external power. There are two ways to unlock: APP, IC card. The open lock record can be queried. So you don't have to worry about the security of your property. Intelligent induction lock: no opening hole/internal installation/card use. So you don't need a key to unlock.