Features: V5.0+AGHSP BT version, available for most of devices with BT function. Elastic knitted material, soft and stylish design. Allows you to keep your music where it belongs - in your ears. You will look great and keep fresh while listening to your favorite music. Keep the sound track to your life playing all the time. Perfect for outdoor activities and a special gift for your family. Specifications: Material: Tapestries BT version: 5.0 BT protocol: AGHSP BT transmission distance: 10m Headphone channel: Stereo (2.0) Music playback time: maximum sound 7H, medium volume 10 hours Microphone distance: 1m BT standby time: 72H Cell capacity: 150mah Cell po wer: 0.55W Speaker impedance: 32 Ohm Speaker po wer: 0.02W Frequency range: 2.4-2.4835GHz Sensitivity: 45db Transmit power: 6dB Audio Output Distortion: 0.6% Audio output signal-to-noise ratio: 93dB Charging time:1-2 hours Maximum input voltage:DC 5V Max input current:150mah Maximum input power:0.55W Color: Black, gray (optional) Item weight: 80g Package List: 1 * BT hair band 1 * USB cable 1 * User manual