Retractable Earbuds Bluetooth Headphone, Wireless Sport In-ear Headset, Stereo Music Earphone,Support Handsfree Calling (Gold) Neckband stysle and retractable earbuds: Easily pressing the retractable cable button to adjust the length of the line ; comfortable in-ear earbuds stays well in the ear when running, jogging, riding etc Built-in microphone and incoming phone vibrate function: The headphone vibrates and reads the phone number when someone calls you even you are enjoying exciting music;Also you can talk with friends via phone with hands-free design Simple to operate: Compatible with most bluetooth 4.0 cellphone (eg.Samsung,Iphone,LG,Sony,Xiaomi,Huawei,Motorola Mobile phone with bluetooth) within 10 meters (no obstacle, line distance) ; Call,Answer,Ended and Redial the last number Rechargeable battery: Usually it takes 2 hours charging. Then you can have 10-12 talking time, 12-14 music time, 360-480 stand-by time.; And you can check the battery status in the phone Sweatproof and rainproof ; noise reduction and echo cancellation ; CSR chip; Support chating by Wechat,Skype,MSN; Apt-X technology