NuTone LA204RWH Wireless Plug-In Door Chime Receiver with Built-In Strobe Light, White White receiver only Built-in strobe light for the hearing impaired or noisy environments Reliable operation and great sound Installs in just minutes - no wires to run 3-1/4-Inch wide x 4-1/2-Inch high x 1-1/2-Inch deep