SIYN HV-800 Black Bluetooth CSR V4.0 Wireless Sports Stereo Music Play Headphones Vibration Neckband Style Headset Earphone for iPhone 6 5s and Android Tablet Cell Phones Unique around-the-neck design,Vibration alert on call 10mm Hifi stereo headphone,very vivid sound Very light and comfortable for all-day use Charging time :2 hours. Working Times: Up to 6 hours Compatible with All Bluetooth-enabled smart phones laptops MP3 / 4 Etc.