Note:Make sure batteries are inserted and test the keys before mounting. We programmed the keys, please test, If the keys can't open, please read the manual and program the keys firstly & test.Please noted:1. Please test the keys before installing.2. This is suitable for wooden door , special for drawer, locker, cabinet, slidding door.3. No need to drill holes, No damage to your cabinet.4. Auto-rebounce and auto-lock function, easy to operate.5. It is compatible with IC 13.56MHZ CHIP CARDS.6. Stainless steel latch and ABS plastic lock body, durable and anticorrosion.7. One master card can be set to open several locks freely. so you only have to keep one key to control all locks. Feature:Multiple Unlock Mode: private mode,public modePower: 4 x AAA 1.5V batteries(NOT include) required Low voltage alert: when the voltage is lower than 4.5V.The batteries can last 8-12 months under normal useWorking Temperature: -30 ? ~ 60 ?Back-up power: 2.5mm socket for emergency power supply.it?s 2.5mm female audio port. ( USB Cable Include and use phone charge or power bank to power it). If you want 5V DC instead of 4xAAA batteries, the lock maybe have lower power alert. You can't input 4xAAA batteries(NOT include) and connect 5V DC for long time, the lock will break. You can use 2-pole or 3-pole or 4-pole 2.5mm male jack, the inner pole is positive, the second pole is negative(GND) Technical ParameterMaterial: stainless steelLock body material: ABS PlasticAccept cabinet or wardorbe door thickness: within 50mm.Suitable for Wooden door onlyPower supply: 4pcs AAA alkaline batteries.(NOT include)Low voltage alarm: 4.5V