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Govee Wireless Door Open Chime, Take Care Of Your Family And Business Mount the door sensor on the door and plug receiver into any standard outlet, and this the door entry alarm is ready to work. When the two parts of the door alarm sensor are separated, door sensor will be triggered, then the receiver will get signal from the sensor. For home security, you can get alert when deter break-ins or children/pets coming out. For business use, ensure never miss a customer when they come Specification: Battery: 23A Ring Volume: 110-80-60-40-0db Ringtones: 36 Receiver Voltage: AC 110~240V,50/60Hz Transmitter Voltage: DC12V Range: 400ft (120m in an open area) Frequency: 315/433 MHz ± 2MHz Operating Temp: 5°F-140°F (-15°C-60°C) Package Includes: 1x Receiver 1x Transmitter 1x User Manual