1) The product is TTlock Type lock, TT Lock APP+IC card magnetic card induction (with TT lock APP). TTlock style lock needs to use the mobile phone ttlock APP to add a key before the key can be unlocked. 2) 8.5mm stainless steel solid lock tongue, high safety factor 3) Swipe to unlock, long-distance sensing, adapt to 99% of cabinet doors, drawers, mechanical automatic rebound, sensing distance 50mm 4) Support emergency external power supply, when the battery is dead, the power supply is unlocked (the external power supply needs to punch a small hole) 5) Low battery reminder function, when the battery is low, it will alarm and remind, after the lock is unlocked in this state, the lock is in the normally open state Power supply:4 x AAA batteries (you need to prepare by yourself, not included) Note:The ones with baffles cannot be installed, and the laminates and baffles cannot be installed Card sensing distance:50MM Unlock :IC card+keyforbs+TTLOCK APP Colour:Black Material:Plastic + steel Package Contents: 1 * lock body 1 * door buckle 1 * IC card 1 * sensor sticker 1 * Mounting Screw Kit(Screw colors are random, no specification is accepted) Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.