and high quality; Master Card/keychain have been set for the lock, no need to be programmed or activated;All you need to do is to install 2 pieces AA alkline batteries, you can use the lock. This is suitable for wooden door only, special for drawer, locker, cabinet, slidding door;No need to drill holes, No damage to your cabinet;Auto-rebounce and auto-lock function, easy to operate. It is compatible with IC 13.56KHZ CHIP CARDS. Stainless steel latch and ABS plastic lock body, durable and anticorrosion. Motor life span is about 100,000 times, The Static Power Consumption less than 5μA;One master card can be set to open several locks. so you only have to keep one key to control all locks. Specification: Types: 3 Keychains Power supply: 4 pcs AA alkaline batteries ( not include ) Battery life span: more than 15 months Operating temperature: -30 degree~80 degree Antistatic behavior: more than 15,000V, information can be saved though in strong static Dynamic Power Consumption: about 200mA Low voltage alarm: 4.8V Accept cabinet or wardorbe door thickness: within 50mm colour: black Material: stainless steel + ABS size: 11.5x8x5.5cm/4.53x3.15x2.17inch Package Contents: 1 x Lock Mortise (body) 1 x Door holder (Side catch) 3 x User cards 1 x External power supply 1 x Installation screw bag(6 pcs)