This Push Button Transmitter from Bellman & Symfon is part of the Visit Smart Home System that helps you to keep tabs on your home. You can put it outside the door and used it as a doorbell button. The Transmitter is lightweight and can be portable and worn with the included lanyard. When someone presses the button, the transmitter will send out a radio signal to the Visit receivers. You will be alerted with loud sounds, bright flashing lights, or vibrations depending on the receiver you have. The Doorbell Push Button Transmitter is a great alerting device to help people with hearing loss, hard of hearing, and deaf stay connected.