1). Keyhole-free design: the remote control lock is installed behind the doors, the theft can't find it

     outside the door. No keyhole on the lock body, you can operate it in the range of 15 meters. It

     contains 4 pieces of  remote key in the packing, of cause you can also add more if you like.

2). Resetting function :If you lost any one remote carelessly, you can reset the code to make the lost

      one invalid, it can be used safety by inputting 260 million different codes

3). The Signal Voice of Unlocking/Locking Door Lock: to make sure if you have successfully locked

      the door.

4). long battery life span: 2 AA alkaline battery can last about 12 months

5). Battery exchange alarm function: to remind you to exchange battery when the power is low

6). USB charging hole: It also support the AC power, if you will be away from home for a long time,

      you can use the USB power to avoild the batter  power exhaust.

7). Humanization design: there is an emergent hole in the lock body, if you lost all the remotes, you

      can drill a little hole in the right position on the door, and you can stick a button to open it.

8)  Manual Emergency Unlocking Design: you can open the lock by press the button and can also

     lock it by pressing another button. You can open it in an emergency if you can’t find your remotes

     immediately.