Function: Two unlocking modes: use card to unlock (perfect for home use); User card + management card to unlock (perfect for businesses, such as hotels, massage parlors, etc.). This electronic cabinet lock kit is used for cabinets, drawers, lockers, storage boxes, etc. for home or business: supermarkets, sauna clubs, gyms, swimming pools, libraries, factories, and offices. 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 2.5 cm, the card can be used for a door with a maximum thickness of 4.5 cm). It can provide good security 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 is low when you touch the card, if there is a longer beep after unlocking, it means 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 Material: ABS plastic Color: Gray/Black Package includes: 1x Battery-free lock 1x Management card (works at about 4.5 cm distance) 3x User cards (works at about 2.5 cm distance)