Two Unlock Modes: Use card to unlock(this is perfect to use ); card + Management card to unlock(this is perfect to use at business, such as hotel, massage etc). This Electronic Cabinet Lock Kit Set is used for cabinet, drawer, locker, storage box and etc. for household or business: supermarket, club, gym, swimming stadiums, library, factory and office. Use ID card to touch outside of cabinet, it lock will and open the door(Note: the tag only can be used for Max.2.5cm thick door, the ID card can be used for Max.4.5cm thick door). It can good safety protection of your personal items while protecting your privacy. It also can children's safety , avoid your children or kids free to open the drawers or cabinet doors. About the battery, when the card is touched, if there is a long beep after unlocking, it means that the battery voltage is insufficient. At this time, the lock can be used about 50 . replace the battery in time. : 86 x 63 x 28mm Colour: White Material: plastic Package Contents: 1 x Lock 3 x buckle card 1 x Card 1 set x screw accessories (screw color random, 't accept the specified color) Note: without AA battery 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.