The Silent Call Sidekick receiver is a table top AC operated alerting device. It is used in conjunction with any Silent Call transmitter such as the telephone, doorbell, smoke detector and/or sound monitor. When the Sidekick receiver detects a signal from a Silent Call transmitter, it illuminates the corresponding front panel LED and activates its built in strobe (and optional vibrator when plugged into the output connector on the side of the unit). The indication will continue for approximately 15 seconds after the transmission ceases.