It is wireless,bluetooth CSR4.0 ,it is built in speakers ,Microphone,it can be used to speaking the phone calls,listeing to the music.
It is washable , when it is dirty , you can wash it after remove the electronis parts.
It is built in Li-battery, when there is no power , you can charge it with the mini USB Cable.
100% Cotton Material , so warm comfrotable! One size fit all.
Range:10M.Very good sound quality.suilt for most smartphones.

Technical Details

Product Details

Product Dimensions

Package Dimensions
Width : 3.3 inch
Height : 3.1 inch
Length : 6.4 inch

Item Weight: 1.6 ounce (View shipping rates and policies)
Shipping Weight: 5.6 ounce (View shipping rates and policies)

ASIN : B01MF5VG37