The CAD Audio WX1000HH is a Frequency Agile UHF Wireless Handheld System which operates in the 510-570mHz frequency band and features 100 channels for optimum clarity of signal. Auto-scan and IR sync functions make set up and channel-changing a breeze. Enjoy up to 12 hours of run time using two AA batteries, with a battery level indicator on both the transmitter and receiver, so you'll know when you need to replace them. All metal construction and included rack mounting hardware help ensure your equipment will stand up to even the toughest conditions.