1. Working distance：≥32 feet.
2. Working time: ≥20 Hour.
3. Operating Voltage:
a. Receiver： USB Port-5V.
b. Microphone：Dry battery AA1.5V*2.
4. Working current:
a. Receiver：37mA.
b. Microphone：30mA.
5. Sensitivity：-51±2dB (OdB=1V/Pa at 1KHz).
6. Impedance：600ohm±10%.
7. Frequency Response：60～14KHZ.
8. Signal to Noise：ADC/85dB,DAC/90dB.
9. Dynamic Range： ≥ 80dBA.
10. Pattern：Unidirectional.
11. Sampling Rate：16Bit/44.1K.
12. Latency：25ms.
13. Microphone indicator:
a. After the microphone is muted, the microphone LED light is always on in red; after the muting is released, the red LED light is off, and the blue light is always on.
b. After power on, the microphone LED light flashes blue quickly.
c. After the connection is successful, the microphone LED light will be steady blue.
14. Receiver indicator:
a. After plugging in the device and using it, the microphone LED light flashes blue quickly.
b. After the connection is successful, the receiver LED light will be steady blue.
c. When there is no signal connection, the indicator light will be off for 10 minutes. After the signal connection is successful, the blue light is steady on.
15. Power Switch:
a. After power on and connection work successfully, short press once to silence the Mic; short press again to unmute.
b. Long press the power button for 3 seconds to turn on.
c. Long press the power button for 3 seconds to turn off.