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 unlocking. 2) 8.5mm stainless steel solid lock bolt for high security 3) Swipe-to-unlock feature with long-distance sensing, compatible with 99% of cabinet doors and drawers; includes mechanical automatic rebound; sensing distance up to 50mm 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 reminder function: alerts when battery is low; after unlocking in this state, the lock remains in the normally 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 1 x IC card 1 x sensor sticker 1 x mounting screw kit (screw colors may vary) Only the items listed are included; other products are not included Note: Due to light reflection and differences in display screens, the color in the image may differ slightly from the actual item. Measurement error allowed is +/- 1-3cm.