1、麦克风射频功率切换开关，H到L衰减7dbm左右,适用远近使用距离切换，KTV置L位置使用，H是远距离场合使用。

2、手持功能锁定，开关由OFF到ON锁定手持操作，防止使用中误操作。

3、红外线对频时对正接收机的红外线发射窗口1米以内进行。

1.Microphone RF Frequency Interchange Switch, H to L It can attenuate more or less 7dbm from H to L, suit use of far and near interchange, L can be used in KTV, H can be used in far range.
2.Lock Hand-held Operation from OFF to ON, for fear mistake when operating.
3.Aim at Rx IR transmit window within 1 meter when IR Channel Selection.