Suitable for wooden door less than 1-inch (25cm) thick.The included keys are already set for use.The lock is programmable, to reset, add or delete keys freely.Two Unlock Modes: Single Unlock Mode, Dual Unlock Mode.Powered by 2x AA 15V batteries (not included).The batteries can last 8-12 months under normal use.Unlock automatically shortly before batteries go dead.The sound alarm will alert when the battery is low.Operation InstructionsResetInstall 2x AA 15V Batteries. Press the Reset button until a long beep.Set Up Admin CardAfter resetting the lock, swipe a RFID card/fob, this first card is configured as the Admin Card.Set Up User CardSwipe the admin card. Then swipe new cards, which you want to add as user card within the beeps.Delete Card1. To delete all user cards: swipe the admin card 3 times.2. To delete all admin and user cards: same as Reset.colour:grayMaterial:ABS + metalsize:Product size: 86 * 63 * 29mmPackage Contents:1x Lock Body1x Latch1x set Screws1x set RFID Cards (1x card + 2x keyfobs)1x Location IconNote: The lock will automatically unlock (pop open) shortly before batteries go dead. Before that, low alarm alerts. So, don't worry about being locked out.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.