Features:  1. Ajustable memory earhook、 it could be arbitrary curved to fit your auricle、 comfortable wearing. 2. Lightweigh、 long standby time、 approx 4h music time、 great for sporting. 3. Bluetooth 4.1 version、 10M transmission distance. Specifications:          General Specification             Brand         HOCO             Model         ES1             Color         Green、 Black、 Red             Wearing Type         In-ear             Net Weight (g)         15g           Technical Parameters             Microphone         Yes             Wired Control         Support             Bluetooth Version         4.1             Transmission Distance         10M             Impedance         16!#!amp!*!Omega;             Frequency Response         20~20000Hz             Battery Capacity         60mAh             Charging Time (h)         2h             Taking Time         3.5h             Working Time (h)         4h             Standby Time (h)         55h    Package  Included:                  1* Bluetooth Earphone