Colour:White-Grey Advanced bluetooth technology it adopts advanced bluetooth 4.1+edr wireless technology, and its wireless operating distance is up to 10m, which is compatible with various bluetooth-enabled devices, such as smartphones, tablets, laptop and more. Hands-free calls built-in dsp noise cancelling and high-sensitivity microphone to reduce noises and grasp the detail of voice to ensure clearer sound from microphone, so you can enjoy hands-free calls. Long standby time built-in rechargeable 80mah lithium battery, with universal for android phones' charging cable to charge the headphone for no more than 2.hours, and it can work lasts up to 5 hours, standby lasts up to 100 hours. Easy operation with magnet design on earphones, you can randomly hang it on your neck and no need to worry its falling; clear button design makes you easily operate power on/off, sound adjustment and modes switch, which bring you much convenience. Compatible with variousof bluetooth phones and bluetooth notebooks, tablet pcs, mid.