More Details: Specifications:          General Specification             Brand Name        ROMAN             Model Number        R551S             Optional Color        Black、 White             Wearing Type        In-ear              Product Weight (g)        8g             Dimensions (cm\/ inch)         67*14*24mm           Technical Parameters             Bluetooth Version        V4.1             Transmission Distance        10M             Bluetooth Protocol        ISSC             Standby Time        180h             Talk Time        6h             Music Time        5h             Charging Time        About 2h            Voice Language        Chinese\/English     Package  Included:                  1 X ROMAN Bluetooth Headphone            1 X Earmuffs            1 X Manual