and high quality; Master Cardkeychain 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;-rebounce and -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 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 + ABS size: 11.5x8x5.5cm4.53x3.15x2.17inch 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 a little different from the real thing. The measurement allowed error is +- 1-3cm.