The Samson Concert 77 CT7 Wireless Transmitter E1 is designed for use as an additional transmitter for the Concert 77 wireless system. The wireless system operates with ultra high frequency for crystal clear operation, ideal for professional applications. The CT7 transmitter attaches to the performers belt and can be used with lavalier microphones, headsets, wind instruments and guitars thanks to the P3 input connection. On-board the CT7 is a 3-segment LED indicator, power and audio on/off switches and adjustable AF level. The Concert transmitter offers up to 12 hours of operation on a single 9-volt battery.