Equipped with two dynamic drivers, one for bass, the other for ultra-clear mid-tones and treble. Designed for classic music, rock music, pop music or gaming with superb quality sound. Never worry falls out special secure ear hook provided a locked-in fit. Sweat resistant sweat resistant designed for running, gym and outdoor sports use. Hands-free the built-in metal microphone allows you to talk hands-free and eliminates exterior noise. Easily control phone calls and music with a touch of a button. Universal compatibility, compatible with both apple and android smart device with 3. 5mm jack. Specification: speaker size: ð¤8 * ð¤5mm frequency range: 20-20, 000hz. Sensitivity: 94ã‚â±3db impedance: 16îã‚â±15% cable length: 120cm what's in the box? avantree dual driver sports earphones carry case spare ear tipscompatibility iphone, ipod, ipad, smart phones, mp3 players, tablets and other devices with 3. 5mm audio jack. Video user guide are available also from avantree site.