Bluetooth Headphone, Ausdom S10 Bluetooth 4.1 Wireless Sport Headphones Bluetooth Earpiece Bluetooth Earphone Stereo Headsets Hands-free Calling Earbuds (Green & White) Bluetooth 4.1 high-quality and lower power-consumption "chip" In-ear earplug design & ear-hook design with builtd-in microphone and supports hands-free talk. Use 10mm NdFeB driver Unit and Frequency response equilibrium technology Dynamic and fluent modeling design, specially designed for sporty, metal grit blasting. Comfortable ear hook design, fit to ergonomic Over 5 hours of continuous calling and playing time, more than 200 hours standby. Drive-by-wire function make it more easy to control the voice volume and music playing. Portable carrying case for travelling, 3 different sizes earplugs, Satisfy your requirements.