Specification: Material: ABS Characteristics: no wiring, creative and interesting, easy to use Wireless connection: 433MHz RF Transmitter distance: 50m (outdoor open space) Transmitter power: 10dBm Ringtone: 38 ringtones to switch, 3 levels of volume adjustable (short press the music switch button to switch the ringtone. Short press the volume adjustment button to adjust the ringtone volume) Receiver power supply: 90-240V~, 50/60Hz Receiver standby power consumption: 0.5W Receiver rated power: 2W Product size: Transmitter size: 71*66.5*28mm/2.77*2.59*1.09in Receiver size: 59*46*48.5mm/2.3*1.79*1.89in Description Effortless Installation: Say goodbye to complex wiring! Our wireless doorbell is a breeze to set up. Simply place the receiver indoors and attach the doorbell button outside your door for a plug-and-play experience that saves both time and costs. Self-Powered Technology: Harnessing the advanced principle of piezoelectricity, our home welcome doorbell button converts mechanical pressure from a visitor's push into electrical energy, sending a signal to the indoor receiver without the need for battery replacements, making it an eco-friendly and energy-saving choice. Long-Range Connectivity: Equipped with enhanced wireless technology, our self-powered doorbell ensures stable signal transmission even in multi-story buildings or large homes. With its wide coverage and reduced interference, you'll never miss a visitor's arrival. Melodious Ringtone Variety: Choose from a diverse selection of ringtone melodies of this smart door bell, ranging from classic tunes to contemporary beat, to match the unique preferences of different family members, adding a personalized touch of charm to your household. Weatherproof Durability:Our cute doorbell boasts waterproof and dustproof capabilities, ensuring reliable performance in harsh weather conditions and extending the product's lifespan. Package 1PC Wireless Doorbell