Model: H5123 Make your life feel more automatic with our new sensors for doors and windows. Connect multiple Govee devices with the sensors while detecting movement from doors and windows. Home Automation: Control other Govee-connected devices in the same space. Maximum Compatibility: Supports 50 Govee smart ecological devices. Stable Connection: 2.4GHz network connection required. 25mm Wide Gap: Works with most windows and doors. Easy to Use: Small and portable without taking up space.