Phone transmitters are surveillance devices, which are placed in the phone set for spying at different places of telephone conversations. These phones have UHF transmitters, which are secure to tape and record all telephonic conversations with loud and clear voice. There are some very important phone transmitter models like Model PLS-34 UHF phone transmitter is very powerful and small size phone transmitter, which is very helpful in spying. PAS-35 UHF room and phone transmitter model has automatic switching between phone mode and room. 

Another important phone transmitter is non-detectable, as it does not need to connect to any phones. This model is known as PLC-50 UHF contact less phone line transmitter. Wireless cameras have unique models made by spy Development Company. Wireless camera CMP-200 Wireless has different benefits. Due to small in size, these room transmitter and high tech equipment are not easy to detect. UHF transmitter model SMV-25 is used in room vehicle. It has AGC system, which can pick the whisper from 40 feet away. 

UHF transmitter used in mobile phone is of very high quality with build in system. Phone transmitters are different from other type of spying equipment as it can transmit sound from certain range, which is larger than other surveillance equipment. 

Some of phone transmitters models are PLS 34 UHF phone transmitter, PLC 50 UHF contact-less phone lines transmitter, and PLH 54 high power UHF phone transmitter. Out of these one-phone transmitter models (PLC 50 UHF contact-less phone lines transmitter) do not need any connecting wires as its wireless transmitter.