Sennheiser EK 2000 IEM CW C-Band, pocket reiveiver for IEM 2000 G3 Systems, 75 MHz bandwitdth, 26 banks with up to 32 frequencies, Limiter, 2x 1,5 Volt AA, 3,5 mm jack out, incl. 1x Sennheiser IE 4 InEar-headphone, C-Band, 718 -790 MHz