Non-opening invisible . Say goodbye to key mobile phone one-key unlock. The mobile phone is your key. Tuya APP quickly unlocks with one key, supports multi-language system, Bluetooth 10 effective connection, and installs a smart drawer switch to farewell to the of finding and losing keys everywhere. Low power consumption, long-lasting battery life: standby up to 1 year. Remote sharing, sharing other people's time control Switch records: inquire at any time including sharing records of others. Anti-lock: low battery reminder, low battery automatically unlock. Bluetooth 5.0 unlocking speed 1-2s, unlocking distance 10m Specifications: Name: Smart Switch Working voltage: 6V (without battery 4 x AAA) Working current: dynamic 200mA, static Less than 20uA Working temperature: 5%~95%RH Product characteristics: moisture-proof / high temperature resistance / corrosion resistance Working temperature: -10- 50 : ABS colour: White Package Contents: 1 x Smart Switch Only the above package content, other products are not included. Note: Light and different displays may cause the color of the item in the a little different from the real thing. The measurement allowed error is +/- 1-3cm.