Feature:1. Modern Design: Self powered doorbell does not require batteries, it generates its own power and sends a steady signal to the receiver.2. Performance: Doorbell is IP68 waterproof and sunproof to withstand harsh weather, and has long service life to bring you a stable using.3. Avoid Interference: The doorbell mainly uses wireless high frequency transmission technology, which will not interfere with other devices in your home or neighbors.4. Thoughtful Design: The sound volume is loud and clear, which can solve the elderly can not hear the trouble, convenient and practical.5. Wide Application: Not only the doorbell, but also as a pager, suitable for sleeping alone baby, elderly and the pregnant women, giving you peaceful guarding.Specification:Item Type: Self Powered Wireless DoorbellMaterial: ABSUsage: Used for families, villas, hotels, factories, the elderly, sick, pregnant women one key callPower Supply: Self PoweredPower Supply: AC100V-230V Power Consumption: 0.25 WRingtones: 38 ringtonesTransmission Distance: open > 150MRF Frequency: 433MHzRingtone Volume: 50dB/1m.Package List:1 xDoorbell1 x Receiver2 x Stickers1 x User ManualNote:Please follow the use of voltage for power supply, the use of other voltage is easy to cause fire and product damage!Please note that the new type and old type of this product will be sent randomly, and make sure you will not mind before ordering.