KKmoon UMI VOIX 3.5mm In-ear Piston Binaural Stereo Earphone Headset with Microphone Earbud Listening Music for iPhone HTC Smartphone MP3 Compatible with most 3.5mm jack electronic devices. With aircraft engine type spiral structure, reduce the effect of resonance, good timbre. Safe, high-grade material, good quality. High sensitivity, good sound quality. With microphone, convenient to use.