Sennheiser EW-DX SK 3-pin Wireless Bodypack Transmitter - V5-7 BandSennheiser transmitters are always packed with high end appointments and reliable performance, and the EW DW SK wireless bodypack is no exception. Built for use with EW DX Evolution Wireless systems, this transmitter can perform up to 12 hours of continuous use. Speaking of range, youll be able to transmit signals at up to 100 meters away from your system, making this unit a cinch for recordings or performances that require a little extra footwork.