BluetootH-Compatible 5.1, 10mm Stereo Driver Unit, Wireless Transmission Distance About 10 Meters, Music Time About 3.5 Hours, Standby Time About 120 Hours, Charging Time About 1 Hour, Earphone Earphone 30mah Battery Capacity, Charge Compartment 300mah Battery Capacity, Touch Buttons, Volume Adjustment, HandS-Free Answer/hang Up Call, Quickly Cut Music/pause/play. specifications: item Name: BluetootH-Compatible Earphones material: Abs model: Xt82 colors: White/black supports BluetootH-Compatible Version 5.1 transmission Distance: 10m speaker Diameter: 13mm Speaker impedance: 32? charging Port: Micro Usb distortion: Percent 1 Percent frequency Response: 20hZ-20khz microphone Sensitivity: -42db 33db charging Time: About 4 Hours music Time: About 3 Hours (90 Percent Volume) total Standby Life: About 28 Hours Of Use, 100 Hours Of Standby headphone Battery: 30mah BuilT-In Rechargeable Battery (included). charging Box Battery: 300mah Buil