Smart WiFi Electronic Door Lock - Keyless Entry with Mobile App, IC Card & Mechanical Key - Secure Mortise Lock for Home (Black) - Perfect for Apartments, Vacation Rentals & Smart Homes

USB + Backup Key=Double AssuranceLow battery alarm on TT Lock app.With Emergency power interface and Low battery warning.The lock can draw back-up power from a 9V alkaline battery. Never Be locked Out.Product Details:Material：Zinc alloyAvailable Color：Black/Silver/GrayDoor Thickness：38mm-55mmPower Supply:4pcs AAA Alkaline batteriesUnlock Way:Tuya App, Code, M1 Card, KeyWorking Temperature：-20~50 degreeWorking Humidity:10%-95%Remote ControlSupport with tuya and smart life app●No need gateway to connect wifi●Remote unlock●Get the unlock records●Send temperary password2.Audio(and menu)guide facilitates set up and operation