and high quality Master Card or 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, 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 , The Static Power Consumption less than 5A 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 Consumption: about 200mA Low voltage alarm: 4.8V Accept cabinet or wardorbe door thickness: within 50mm colour: black Material: stainless steel and ABS size: 11.5x8x5.5cm or 4.53x3.15x2.17inch Package Contents: 1 x Lock Mortise (body) 1 x Door holder (Side catch) 3 x cards 1 x External power supply 1 x Installation screw bag(6 pcs) Only the above package content, other products are not included. Note: Light and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is 1-3cm.