The Sennheiser XSW-D XLR Base Set makes building a Wireless system child?s play. Benefit from one-touch ease-of-use and 2.4GHz digital operation for worldwide, license-free compatibility. This system is robust enough for everyday use, delivering a 250-foot operating range and up to five hours of battery life on a single charge. You also get a convenient mute function on both the transmitter and receiver. The XSW-D XLR Base Set is supremely elegant ? it makes going Wireless with your dynamic microphone effortless while providing the level of quality and reliability that Sennheiser is known for.