Features: 1. The transparent air duct uses the air to transmit the sound very original and clear. The air duct is easy to conceal, and the air duct transmits signals to reduce noise. It is good to use the buttons with U94PTT, and the large PTT is easy to operate 2. Bracket-type throat vibration noise reduction earphones, avant-garde engineering design, easy to shrink and wear, the size of the coil can be adjusted, and the size can be adjusted according to the adaptation of the neck. The throat vibration emits sound, and it is highly noise-proof even when used in a very noisy and harsh environment. The surrounding noise, including the sound of wind, will not be heard. 3. It is suitable for half helmet, full helmet, and also suitable for wearing a mask and a ventilator. Applicable scenes: jungle, field battle, outdoor riding 4. U94 PTT part adopts high-intensity PTT, which can be pressed continuously for 30,000 to 50,000 times 5. The wire is made of cold-resistant PU tensile wire, which has high flexibility and strong toughness 6. The speaker adopts 32Ω±15 Percent @1KHZ imported from Taiwan, the sound is loud and thick Specifications: Sound pressure level 108±3dB@1KHZ 1mW Rated power 50mW Maximum power 100mW Speaker impedance 32Ω±15% @1KHZ Microphone Sensitivity -31±5dB@1kHz 0dB=1V/0.316G Output impedance 1200Ω±15% @1KHZ Package include: 1* set headset + U94 PTT