1) This is a TTlock type smart lock that supports TTlock APP, IC card, and magnetic card induction. The TTlock app must be used via smartphone to add keys before unlocking functionality is enabled. 2) Features an 8.5mm stainless steel solid bolt for high security. 3) Swipe-to-unlock technology 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 depleted, temporary power can be applied to unlock (external power requires access through a small hole). 5) Low battery warning function alerts users when battery level is low. In low battery mode, after unlocking, the lock remains in a normally open state. 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, keyfob, 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, no color selection available) The package includes only the items listed above; other accessories are not included. Note: Due to lighting reflections and differences in display screens, the item color may vary slightly from the images shown. Measurement error allowed within +/- 1-3cm.