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Wireless Doorbell Technical Parameters: Receiver working voltage: AC100-240V 50HZ/60HZ Receiver power consumption: 0.5W Working frequency: 433MHz Transmitter power consumption: <10mw (spectrum analyzer antenna combined test, CE limit) Transmitter battery: 12V23A alkaline battery Battery life: estimated 20 times per day, about 1 year Volume adjustable range: 25-85dB (tested at 0.5 meters with decibel meter) Wireless distance: about 280 meters in the open air, about 20-50 meters indoors with obstacles Note: The wireless distance is affected by walls, radios, metals, etc. It is normal to have certain deviations in actual use. Packing List: -1 Set Wireless Doorbell Why Choose Us? <1>36 Ringtones <2>4-Speed Volume <3>40M Remote Distance <4>300M Range in opreating space Durable and Long-Lasting <1>Stay Dry. Built to Last. Long Power <2>Operating Temperature:-4°F/-20C~140F/60C <3>Large capacity battery(Maximum Lifespan) Our Wireless Doorbell: 984ft(30OM) Wireless Range. Other Doorbells Only 500-650ft(150-200m)wireless range. 36 Ringtones Switch Freely Ding dong Moscow Nights Lake baikal Mozart Romeo and Juliet ...etc. LED Indicator & Mute Mode <1>Specialized for baby sleeping and nap time. <2>Flashing colorful LED lights also help hearing impaired. Button Power supply method: 12V23A alkaline batteryTransmitter power consumption: =10mw (Spectrum analyzer antenna combination test, CE limit)Battery life: estimated 20 times per day,about 1-2 yearsWireless distance: about 300 meters in open space,Indoor- about 20-50 meters including obstaclesWorking temperature:-20-60t Transmission frequency: 433.92MHz Ring The Bell Power supply mode:AC100-240V 50HZI60HZVolume adjustment: 8-level volume adjustmentMusic adjustment: 38 chord music olume range:25-85dB (Tested at 0.5 meters with decibel meters) Working environment: humidity <80%Working temperature:-10-60 ports Receiving frequency: 433.92MHz Feedback and Rewards: Good Feedback - Your satisfactory evaluation will have a positive effect on promoting our business.If you can leave a five-star praise and pictures, we will so glad for this. Bad Feedback - If there have any problem with your package,please contact us before you leave comments ,we will offer best service to solve your any problem Until you are satisfied.