The Flashing Remote Doorbell is a flashing light signal designed to alert individuals with hearing disabilities to the ringing of the doorbell. Encased in a clock base with LED display, this remote doorbell features a flashing light and night-light settings in addition to 32 different musical chimes options. This unit also functions as a standard alarm clock and stopwatch and works up to 50 feet away from the doorbell. The unit comes with hanging hardware. POWER: Battery backup uses 4 AAA batteries and doorbell uses a 12-volt battery (not included). DIMENSIONS (Clock/flashing alert): (HxDxW): 5.5 x 3.25 x 5.5 inches. Doorbell button: 2.75 x.75 x 1.75 inches.