During the sport, especially when I'm indoors, I sweat a lot and although I can tell you that sweating is the enemy of the headphones and then it slides off the rails and headphones and the sound is not good. Here, the point of it all. Tonight I took him with me. Well, I have to say really, this helmet is waterproof at least to sweat because, obviously, he does not will resist a stay in the water. I've had no sizzle or premature termination of the helmet. The helmet has continued to function during my cardio session on the machine and do not become sticky.
The battery lasts a good ten hours, no worries on that side. The headset turns easily, the volume buttons are accessible correctly, it is a habit. Ditto for the buttons forward / back.
Connectivity level: my laptop was in my bag in the locker room of the gym and I was a few meters away I will say good 5 meters. So it's really nice. It works, I always had my music. The sound is good.
However, if the headphones are comfortable when first put in place, after one hour of sport, I feel discomfort behind the ear. So I know I'm sensitive (a telescopic arm set incorrectly and it's horrible for me) but still.
Regarding the phone mode, I feel that the microphone is not very powerful. I had to talk louder than usual because my partner struggled to hear me and yet, it has slightly improved things.
Because of these last two points, I take a star because for the price, it is already excellent value for money and we can not expect better and that I, in my gym, I did not answer the phone
