RF Doorbell Transmitter Acoustic (Lisa RF)

The LISA RF doorbell transmitter AC alerts you to the doorbell with a flash lamp and an acoustic signal in the room where you place the receiver. The transmitter is also equipped with a person call button and a channel selector switch.
With this doorbell transmitter you will receive a 9-volt block battery, as well as a microphone that you simply stick to the sound opening of the house bell. Good to know: Disturbing ambient noise near the microphone can be filtered out with an adjustment control.