The all new, state-of-the-art, DB200 is the only doorbell and intercom signalers that require no wires and can be installed in seconds. Unlike competing models, the DB200 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 door, rear door, or intercom (requires additional sensor, sold separately), and a built-in chime for hearing members of the family (can be turned off). The DB 200 has a built-in outlet to flash an attached lamp and each sends a signal to all Sonic Alert remote receivers.