Mini Wireless Stereo Bluetooth, Daydayup S520 invisible Bluetooth Headset Small earphone Earpiece Headphones With Hands-free Stereo Music Support Stream Music/Video/Audio (Black) Stealth Earphone, 20mm ultra-small body, completely"stealth"in auricle. Latest V4.0 Blurtooth: Import CSR 4.0 chip,strong compatibility. Multipoint technology for connecting with 2 Bluetooth mobile phones at the same time. Embedded microphone for hands-free conversation from Bluetooth-enabled mobile phones. High fidelity sound quality: High quality audio output,perfect sound effect.