Feature: 1. NOISE REDUCTION: 7.1mm motorcycle bilateral helmet headset, designed for use with motorcycle helmets. The microphone reduces noise and the sound is clearer. 2. STEREO AND COMFORTABLE: This motorcycle helmet headset has stereo sound and good sound quality, which provides great comfort to your ears. 3. PTT MATERIAL: U94 PTT part adopts high strength PTT, which can be pressed continuously for 30,000 to 50,000 times. Push the button to activate the PTT (Push to Talk) device. 4. WIRE MATERIAL: The wire is made of cold resistant PU tensile wire, which has high flexibility and toughness. Suitable for Hytera PD600 PD602 PD605 PD662 PD665 PD680 PD682 PD685 X1p X1e. 5. EASY TO USE: The motorcycle helmet earphone has a hook and loop, which is easy to fix, very durable and easy to use. With a clip, it can be hung on clothes or belts. How to Use: Plug and play Specification: Item Type: Helmet Headset+U94 PTT Material: ABS Colour: Black Frequency Response: 150Hz-500Hz Sensitivity: 46-60dB Impedance: 8 Ohm Application: Suitable for Hytera PD600 PD602 PD605 PD662 PD665 PD680 PD682 PD685 X1p X1e Package List: 1 x Helmet Headset 1 x U94 PTT