> Direction: don't need to distinguish the door direction, left and right sides, both inside and outside the door, can be universal > Automatic close: unlock if you don't open the door, delay lock automatically after 15 second > Without collision: close the door automatically locked without noise > Low power consumption: Power consumption is only equivalent to one 5 of the electric control lock > Service life of up to 350000 times > The lock and close the door when a voice prompt