Additional Details ------------------------------ Product description: Kenntsh Cannot unlock when the battery is exhausted. When the fingerprint is not recorded, any fingerprint can be unlocked. If are recorded, only the recorded can be used to unlock the lock. Therefore, under normal circumstances, you must record more than two to prevent the embarrassing situation of the fingers being scratched and unable to unlock. Colour: Black Material: zinc alloy Package Contents: 1 x fingerprint padlock 1 x USB cable 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.