The Silent Call Signature Series Door/Window Access Transmitter is a valuable tool for home safety and security and a great convenience for the deaf and hard of hearing. The transmitter sends a signal to the Silent Call Sidekick II Signature Series Receiver and a variety of Silent Call receivers. (Receiver sold separately.)
It works using two magnetic contact bars that are easily installed (one on the door or window and the other on the surrounding frame) to maintain magnetic contact with each other. When the door or window is opened, the bars lose magnetic contact, triggering the transmitter. Operates on 2 AAA batteries (included.) 5-year limited warranty.