Telephone  transmitters intercept telephone conversations by installing a transmitting device on the telephone line sending a radio signal to a receiver or recorder nearby

cordless telephone recorder More info	Infinity Telephone Call Monitor More info	Minature Telephone Transmitter More info
Office Telephone System Bug More info	Telephone Dual Adapter transmitter More info	Telephone Dual Adapter transmitter USA Type More info
UHF Mini Telephone Transmitter More info