... no contact, no impact, no noise;2, sound and light locks working state automatically prompts warning; wrong unlock ... , will not be affected;4, for a voltage: DC 12V, but when the backup power supply voltage down ... a key or lock;7, with the upper and lower lock drive seat, left open the same lock, right open ... 1.6B standards;11, the lock with Japan imported motor, durable service life of up to 50 million ...