• 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