55 Chord Ringtones & Adjustable VolumeThe outdoor wireless doorbell has 55 kinds of polyphonic ringtones and the volume is adjustable from 0-110dB in 5 levels, easy to choose and adjust your favorite ringtones and the volume you like. suitable volume. 300m/1000ft Wireless RangeThe operating range is 150m-300m in an open area without obstacles. The waterproof outdoor wireless doorbell design is suitable for families, offices, apartments, etc. Memory function and LED flashThe wireless home doorbell can help you keep the latest melody and the last volume level after power off without resetting previous settings. The wireless doorbell with LED indicator is convenient for the elderly and hard of hearing. High Performance TransmitterIP55 dustproof and waterproof transmitter can withstand all kinds of weather conditions extremes and operate between -22F and 158F. Simple InstallationPlease install the wireless smart doorbell after pairing. Put 3 AAA batteries (excluded) into the battery box of the receiver, you can place the receiver anywhere you like; for the transmitter (23A 12V batteries, included), you can choose to fix the transmitter to the wall with the included double-sided adhesive tape or the corresponding screws.