WiFi Connection: With WiFi connecting mode, control with "Tuya Smart" App. No cable is required, easy to use Send Alerts to Your Phone: When door/window is opened or closed, the sensor will push instant notification to your smartphone immediately. You can check your house via phone wherever you are Low Power Warning: When the battery is running low, it will automatically push messages through APP to remind you to change battery, never worry about running out of battery Voice Control: By connecting the smart sensor with Alexa or Google Assistant to realize voice control. Come to make your smart home life more convenient and easier Easy to Install: No complicated installation step. Support self-adhesive installation and screw installation Suitable Scenery: Not only suitable for front doors or windows, but also for garage doors, liquor cabinets, front gate, safety deposit box, pet doors and more Specification: Input voltage: DC 3V Battery capacity: 100mAh Quiescent current: ≤35uA Alarm current: ≤135mA Low power undervoltage: ≤2.4V WiFi: 802.11b/g/n Magnetic control distance: ≤20mm Light range: 0~10000LuX Working temperature: -10℃~+50℃ Working humidity: maximum 95%RH