Product parameters:Wireless technology: wireless personal area networkBattery life: more than one year (20 times a day)Operating voltage: DC 3V (CR2032 battery)Operating temperature: 100C to +550CLow battery indicator: YesDimensions:Main body: 65mmx26mmx12.7mmAlarm trigger distance: 235mmMagnet: 38.8mm*10.9mm*13mmFeature:[Make your door/window smarter]when you leave the house, it will send you a notification if doors or windows are open or invaded by an external body, you'll find anomalies in your home immediately[WiFi powered battery]full of longlasting power, replacing the battery is simple, more intimate service[PLUG & PLAY with Tuya/smartlife APP ] No hub required, simple download of the tuyasmart app on iOS and Android.Package Included:1 Set* (1 door/window sensor, 1 manual)