1) The product is a TTlock type lock, compatible with the TTlock app and IC card magnetic induction (includes TTlock app functionality). This lock requires using the mobile phone TTlock app to add a key before it can be unlocked. 2) 8.5mm stainless steel solid bolt for high security 3) Swipe-to-unlock feature with long-distance sensing up to 50mm; compatible with 99% of cabinet doors and drawers; includes mechanical automatic rebound function 4) Supports emergency external power supply: when the battery is dead, temporary power can unlock the device (external power requires access through a small hole) 5) Low battery reminder function: alerts when battery is low; after unlocking in this state, the lock remains in the normally open mode Power supply: 4 x AAA batteries (not included) Note: Cannot be installed with baffles; laminates and baffles are not supported 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 buckle 1 x IC card 1 x Sensor sticker 1 x Mounting screw kit (screw colors may vary; no color selection available) Only the items listed above are included; other accessories are not included Note: Lighting effects and display settings may cause slight color variations between the image and the actual item. Measurement error allowance: +/- 1-3cm