1) The product is a TTlock type lock, compatible with the TT Lock APP and IC card magnetic induction (includes TT Lock APP functionality). This lock requires using the mobile phone TTLock app to add a key before it can be unlocked. 2) Features an 8.5mm stainless steel solid lock bolt for high security. 3) Swipe-to-unlock function with long-distance sensing capability; adapts to 99% of cabinet doors and drawers. Equipped with mechanical automatic rebound; sensing distance up to 50mm. 4) Supports emergency external power supply: when the battery is depleted, temporary power can be supplied to unlock (external power supply requires accessing a designated contact point). 5) Low battery reminder function: alerts user when battery is low. After unlocking in this state, the lock remains in a normally open condition. 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) Package includes only the items listed above; all other items are not included. Note: Lighting and display differences may cause slight variations between the product color in images and actual product. Measurement error allowance: +/- 1-3cm.