... bluetooth MIC 3.sensitivity:86db 4.property:2.4G MIC built in wireless handheld microphone Function:1.It has more than 1000 ... ,eliminating the line.4. Staff of a small size, easy to use.5. LCD display power supply,low battery,signal link ... for 30 hours,standby time :60 days.More specifications: signal-to-noise : ≥80dBReceiving Sensitivity: ≥85dB±2dBFrequency Response: 50~15KHzWorking Frequency: 2402 ...