Optical Talk Set TW4103 is an intelligent and efficient instrument that combines in one set the functions of both a digital optical phone and a stabilized light source. It is widely used in operations of installation, optical testing, maintenance and fiber attenuation value testing in data network, CATV and Telecommunication network. The TW4103 Fiber Optical Talk Set can carry out full-duplex communication with high quality connection and not be affected by distance. Features Full-duplex digital communication with high quality conversation connection and low background noise Together with Optical Clip-on Coupler, enables on line communications available Combining functions of both a digital optical phone call and a stabilized light source. Large LCD display with backlight Low battery power indication ApplicationsMaintenance in Telecom Maintenance CATV Test Lab of optical fibers Other Fiber Optic Measurements