Stay unplugged as you plug into unparalleled wireless performance that will deliver sound on the go, wherever you go Bluetooth technology CSR 8640 with advance audio distribution profile and audio/video remote control profile, Bluetooth 4.1 allows specify the reconnection timeout intervals for their devices, also connect two devices at the same time, now you can connect your earphone with two phones or two Bluetooth devices at the same time Developed for training and practicing in any condition, these can endure through rain, water and sweat, it complies with the stringent IPX7 certification Ergonomically designed to allow in a certain amount of ambient noise so you're aware of your surroundings during active use, they reduce the ambient noise but don't cancel it out to keep you aware of what is going on around you while you stay fit Now you can enjoy your favourite tunes all day thanks to the 60x2mAh smart rechargeable Li-Polymer battery that plays for up to 8 hours and provide standby of 240 hours Now you can pause/play, change tracks, adjust the volume and even answer calls with a simple tap of the control board with the in-built mic, so turn up the volume, plug in and tune out in style Sonically welded shut, blocking out sweat, rain, or other type of moisture that would otherwise ruin your earphones Dynamic 8mm drivers pack a punch of true bass like no other, delivering a rhythmic response to even the most demanding tracks