Signature Series Home Alerting Kit with Doorbell Doorbell transmitter sends a wireless signal to the Sidekick II receiver for doorbell alerting. Phone line plugs into Sidekick II receiver for phone/VP call alerting. Vibration and flashing strobe alerting. LED display and indicator lights on the Sidekick II receiver show the alert type. Includes Sidekick II receiver, doorbell transmitter and bed shaker.