GBSELL BT531 Wireless Bluetooth 3.0 Stereo Sports Hands-free Headphone Volume control,with Mic For iphone 7 Samsung Gala

Bluetooth version: BT3.0;Excellent sound quality !
Good connection,convenient to keep !
Volume Control!Volume control / Variable for per stage : Stage 16 / 1.5dBvariablefor per stage.
Good battery life !Standby time: 120 hours;Talk time: 7 hours ;Battery: Rechargeable lithium polymer battery 3.7V; 120mAh
You can use them about anywhere, gym, outside, motorcyle,biking ,lounging in the house.