The Contact Mat from Bellman & Symfon is an accessory specially designed to work with a Visit transmitter or receiver, as part of the Visit smart home system. Typically, you can place the Contact Mat by the front door or by the bed and connect it with the Telephone Transmitter or Baby Cry Transmitter. When someone steps on the mat, it will activate the Transmitter to send out a radio signal to the Receiver wirelessly that alerts you with audible sound, bright flashing lights, or strong vibrations (depending on the receiver). This way, you will be notified when someone is trying to enter or leave the room or get out of bed. It is a great alerting accessory that helps people with hearing loss, hard of hearing, and deaf to keep track of the comings and goings within your house.