This Plug-In Doorbell has a high-quality sound that comes with 6 tunes and has a range of 350 ft. (107m) and a Sound Level of 84 dB. You can conenct up to 4 transmitters simultaneously, such as push buttons and awareness devices (door contacts, motion sensors). It is an easy installation as it is a plug in (No batteries needed). It has an illuminated Halo and strobe alerts with 7 Cusom LED halo alert colors and assignable halo and strobe alerts per push and accessories. The weather resistant, surface mount, Push Button has an illuminated Halo LED feedback and Wireless "E" Push-button compatibility. 1) Adjustable volume, sleep mode, and mute (Mute timer 3, 6, 9, 12 hrs and permanent mute) to adapt use for time of day, 2) Honeywell ActivLink robust signal, 3) The CR2032 battery for the Push Button is included, 4) the doorbell can also be used as a night light. Grey.