I hope this help someone, the instructions are not clear. Al amoldar firmemente aislan muy bien el ruido exterior. All in all, this is probably the best Bluetooth headset I have used. Just had an issue with the chain, it broke when I was trying to hug my friend. G-Wolves didnt skimp on the quality of the mouse itself either. This light is great! ThIs was a bit disappointing because without the strap you end up holding this case in your hand , and believe me, it is a handful! Static a lot in ears cant explain just really cool! its comfy it makes you work up a sweat.