The Silent Call Signature Series Telephone Transmitter connects in seconds to the jack of any standard analog phone line. When the telephone/TTY/VCO rings, the transmitter sends a signal to any Silent Call Signature Series receiver. (Receiver sold separately.) Ideal for the deaf and hard of hearing.
Operates on 2 AAA batteries (included) and has a range of up to 2000 feet. Dual phone jack included. 5 year limited warranty.