... ,CE,ISO9001,bluetooth 3.sensitivity:86db,compatibility 4.2.4ghz,mic built in 5.wireless microphone Wireless Microphone for ... is what you need, this microphone is perfect. 2.4GHz emitter, microphone and processor are combined in this all-in-one unit ... : charging,ungradeFunction:1.Multichannels:It has more than 1000 channels.2.Compatibility:The same transmitter can be used on different receiver ...