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