White Cover, Plug In Strobe Chime, For Hard Of Hearing Or Noisy Environments, Strobe Light Flashes When Doorbell Rings, Transmission Range Up To 100′, Adjustable Volume Control, Wireless Push Button With Battery Included, 3 Sound Options: Westminster, Ding Dong & Ding, Sound Decibel: 75 Decibel Maximum, 3.5″W x 1.74″D x 4.625″H.