Features: 1. The single earphone has a part of a flexible air tube that is more convenient to use while driving and exercising. 2. Professional audio-visual, cut off noise, and sound quality. 3. The product is far from electromagnetic, more environmentally friendly and has radiation protection. 4. The product has a button to control the mobile phone. Press once to answer/hang up the phone or pause thw music. Press twice to resume music playback when the music is paused or switch directly to the next song twice. 5. Keep away from electromagnetics, safe and convenient. 6. Flexible, resistant to distortion and durable. 7. This product is suitable for iOS and for Android devices by adjusting the switch. Specifications: Impedance: 16±20%0.126V, 1 kHz Frequency range: 20Hz~20kHz Resonance frequency: 4KHz±20% Rated power: 100MW L/R output difference: 3dB at 1KHz1MW Output sound pressure level: 102dB Length: about 100cm/39.37inch Weight: about 20g Package Size: Approx. 14.3*9.6*1cm/5.63*3.78*0.39inch Package List: 1 * Headset 1 * User Manual