... , 8*32 Channels Wireless Conference Microphone(ACT / IR )FEATURE :*use UHF 500-980MHz range ,adopt PLL combined technology ,and the transmitter ... the ideal using range .Technical specification :1)FUNCTION Frequency range :UHF 500-980MHz adopt CPU controlWith PLL combined technology :1 group ... :2*AA batteries ,standing time :about 8 hours U-8 UHF PLL eight channels wireless microphone (8*32channels)