1. 25dB noise-canceling effect for ear protection in noisy environment; 

2. Comfortable and noise-canceling sponge cushion;  

3. Adjustable head band for comfortable wearing. 

 Speaker specifications: 

1) Sound pressure level:  90dB±4dB/1W at 0.1m 1KHz  

2) Impedance: 2x8Ω±15%@1kHz 

3) Power: 1W(rated) /1.5W(max) 

Microphone Specifications: 

1) Sensitivity: -51±3dB@1kHz 3v 2.2k 0dB=1v/Pa 

2) Direction: Unidirectional 

Operation Temperature: -30 to 55°C 

Storage Temperature: -40 to 55°C 

PTT key life ≥ 100000