This lock is widely used in apartments, office, hotel, rental house. The lock can work both TTlock app and TThotel app. TTlock app is mostly for apartments and office use; TThotel is mostly for hotel use, it is the online hotel management system, which can be remotley controlled on computer and phone app.       Lock Details  Lock material: stainless steel Color: silver, copper, black Card type: 13.56mhz card Bluetooth standard: bluetooth 4.0BLE Support phone system: Android 4.3/IOS7.0 Power supply: 4pcs AA batteries Low voltage alarm: support Working temperature: -40~70 degree Working current: less 200mA Standby current: 35uA Unlock way: APP, password, card, keys App send password: no limited Custom password： 150pcs Fit for door thickness: 38-70mm Fit door type: wooden door       Stainless steel mortise         For aparmtent use  For apartment or rental house use, you can download the TTlock app on smart phone.       Send e-Key and Password to unlock  The e-key and password with the valid time, which is portable for you to manage in rental house,