The SK 2000 Bodypack Transmitter from Sennheiser is ideal for musicians with its wide frequency ranges and plethora of features. This sturdy transmitter uses 4 RF output powers (10, 30, 50, or 100mW) for extended transmission ranges and more channels per frequency range. The optional rechargeable batteries can be charged inside of the unit with the external charging contacts. In addition, Sennheiser Control Cockpit Software (download) offers easy handling, control, and maintenance for the Digital Wireless System. It provides a global overview of all network-enabled devices, shows all status information, and makes setting adjustments very easy.