Product parameters: Wireless technology: wireless personal area network Battery life: more than one year (20 times a day) Operating voltage: DC 3V (CR2032 battery) Operating temperature: -100C to +550C Low battery indicator: Yes Dimensions: Main body: 65mmx26mmx12.7mm Alarm trigger distance: 235mm Magnet: 38.8mm*10.9mm*13mm Feature: [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 [Wi-Fi powered battery]-full of long-lasting 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)