Specifications:

Bluetooth: V3.0+EDR

Frequency: 2.402-2.480G

Battery Built-in: 3.7V/100mA Li-on battery

Effective Range: About10m

Charging Time: 2H

Standby Time: About 1H

Working Time: About 3.5H

Circumferance: 40cm (elastic)

Package Include:

1 x Bluetooth Headband

1 x USB Cable