1) This product is a TTlock type lock that supports TT Lock APP, IC card, and magnetic card induction (TT Lock APP included). The TTlock style lock requires using the mobile phone TTlock APP to add a key before unlocking. 2) Features an 8.5mm stainless steel solid lock bolt for high security. 3) Swipe-to-unlock function with long-distance sensing up to 50mm. Compatible with 99% of cabinet doors and drawers. Equipped with mechanical automatic rebound. 4) Supports emergency external power supply. When the battery is dead, power can be supplied externally to unlock (external power supply requires a small hole for connection). 5) Low battery reminder function. When the battery is low, the lock will sound an alarm and flash a warning. After unlocking in this state, the lock remains in the open position. Power supply: 4 x AAA batteries (not included) Note: Installation is not possible on doors with baffles or laminates. Card sensing distance: 50mm Unlock methods: IC card, key fob, TTLOCK APP Color: Black Material: Plastic + steel Package Contents: 1 x lock body 1 x door strike plate 1 x IC card 1 x sensor sticker 1 x mounting screw kit (screw colors may vary) Only the items listed above are included; other products are not included. Note: Due to light reflection and differences in display screens, the color in the picture may slightly differ from the actual item. Measurement allows an error of +/- 1-3cm.