Function: Two unlocking modes: use card to unlock (perfect for home use); User card + management card to unlock (perfect for business, such as hotels, massage etc.). This electronic cabinet lock kit is used for cabinets, drawers, lockers, storage boxes etc. for household or business: supermarket, sauna club, gym, swimming stadium, library, factory and office. Use the ID card to touch the outside of the cabinet, it will lock and open the door (Warning: the tag can only be used for a door with a maximum thickness of 2.5cm, the ID card can be used for a door with a maximum thickness of 4.5cm). It can provide good safety protection for your personal belongings while protecting your privacy. It can also improve children's safety at home and prevent your children or kids from opening drawers or cabinet doors. If the battery when you touch the card, 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 times. Please replace the battery in time. Features: Main lock: 86*63*28mm < p>Material: ABS plastic Color: Gray/Black Package includes: 1x Battery-free lock 1x Management card (Works at about 4.5cm distance) 3x User cards (Works at about 2.5cm distance)