The 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.