Features ---Comfort-fit: Ergonomic customized design, to ensure a comfortable ear sense ---Super-Stereo Sound: Hifi metal bass earphone, shake your deep inner mind with every beat. ---Voice Prompt; Wideband audio supported, Voice-prompt for Paring, Power on/off, Battery Level etc. ---Ergonomic wireless earbud; Double safety, anti-off from accidental bump or shake. ---Strong compatibility and compatible with devices as long as they are Bluetooth support. ---Flexible, light weight, comfortable fit and durable design. Best choice when you do sports. ---Sweatproof Headphones Earbuds Wireless Bluetooth V4.