Kinda crappy to get good headphones only to find out the cord doesn?t work to charge them. New update. They do exactly that and theres a voice command to ensure this. - Very light and compact charger box. Its bit low for a 510 to sit on to change shoes. I took then skiing and I work out with them and they stay in no problem and are super comfortable. I love this subwoofer and the fact that I can easily adjust the base depending on the loudness. And as if this wasnt enough, every button on the headset can be programmed to your preference with a few simple clicks. Its very compact good for a corner of a room like within office space. But overall I would say the heart rate is accurate and comparable to a chest strap monitor under regular usage and non high intensity workouts.