... Lightweight:30g mic 4.laser,page up/down microphone jack to usb,Bluetooth Wireless MicrophoneFunctions:Function Diagram: Function: 1.Multichannels: ... so on.6. Remote electronic laser pointer,page turner, USB upgrading.7. Pen designed,instead of any other MIC. ... 45G Dimension: 95.5*33.5*18(mm) Specification:signal-to-noise : ≥80dBReceiving Sensitivity: ≥85dB±2dBFrequency Response: 50~15KHzWorking ...