The state of the art DB100 is the only doorbell signaler that requires no wires and can be installed in seconds Unlike competing models the DB100 is not triggered by sound so annoying false alarms are a thing of the past Other advanced features include selectable number of flashes 5 or 10 different flash code for front or rear door and a built in chime for hearing members of the family that can be turned off if desired The DB100 has a built in outlet to flash your attached lamp and each sends a signal to all Sonic Alert remote receivers Uses 1 A23 12V battery not included Features Works in homes with all doorbell systems Built in outlet to flash lamp Wireless installation Sends signal to remote receivers Different flash codes Built in chime Selectable number of flashes U L Listed Top quality 5 year warranty Product dimensions imperial 1 25 inch H x 5 25 inch L x 3 inch W Product dimensions metric 31 75 mm H x 133 35 mm L x 76 20 mm W Package dimensions imperial 4 inch H x 6 5 inch L x 3 inch W Package dimensions metric 101 60 mm H x 165 10 mm L x 76 20 mm W