Connecting with 2.4GHz WiFi(No 5G support), you can remotely monitor the smart door alarm. Alert will be sent to your phone when the door/window opened/Clsoed. Help monitor your house when you're away from home. You don't have to worry about your baby going out of house without notice, Easily know when your aged parents leave or arrive home. Even clear when someone enters your home, shop, office, etc. Specification: App: Smart Life/Tuya Smart app Material: ABS Plastic Power Supply: DC3V 2*LR03 ( Included) Wireless type: 2.4 GHz ?5GHz is not supported!? Standby Current: 35uA Working Temperature: -10°C ~ 50°C?14?-122?? Size: 2.73*1*0.63inches/69.5*24*16mm