The Sonic Alert DB100 is the only doorbell signaler that requires no wires and can be installed in seconds.  This state-of-the-art doorbell works in homes with most doorbell systems, selectable number of flashes (5 or 10), built-in chime for hearing members of the family (can be turned off), built-in outlet to flash an attached lamp and each. Different flash code for front door, rear door, or intercom (requires additional sensor, sold separately) Also able to send signal to Sonic Alert Travel Clock (also in this catalogue).  Does NOT contain telecoil function.
ADDITIONAL transmitter / sensors are available to allow signaling in other rooms.  Up to 4 can be used with the main DB100 transmitter.