· Supply voltage : 2.75 to 5.0v, Utilize of Two-way radio electricity
· Current consumption : typically under 40mA

- Under 4mA : Manual Operate
- Under 15mA : Voice Recognition Operate
- Under 20mA : Voice Recognition / PTT Operate

· Mic type : Dynamic mic (noise canceling)
· Mic impedance : 450 Ω at 1kHz, nominally
· Mic sensitivity : -56dB re 1v / Pa, 1kHz
· Speaker impedance : 1k Ω at 1kHz, nominally
· Speaker sensitivity : 94dB re 1v / Pa, 1kHz
· Speaker distoration : < 5% at 1kHz

· Usage temperature : -30°C to +55°C
· Storage temperature : -40°C to +70°C
· Humidity range : up to 95% RH