... jack 2.ISO,CE,CCC bluetooth MIC 3.sensitivity:86db 4.property:2.4G MIC wireless hidden microphone system Function:1.It has ... transmitter can be used on different receiver.3. Built-in MIC design,eliminating the line.4. Staff of a small size ... turner, USB upgrading.7. Pen designed,instead of any other MIC.8.Lithium Battery Environmental protection.9. It can work for ...