The vents on the side light up, as well as on the microphones spearhead. After a week and they broke in, the fit is perfect. They are sadly QUITE lacking in BASS unlike a lot of the KZs ive come to love. Wear well! I havent washed them yet so dont know if they will stand up to that but I am satisfied. I bought another one for my new motorcycle. The noise cancellation is the best part of these earbuds; battery life and Bluetooth strength are perfect. Think high quality earbuds, but theyre over the ear ones. You need to push your feet to the top to make slippers stays on your feet While I could hear the caller clearly, there were blackouts in the call, where you would think your call dropped due to the dead silence, only to find out when you pick up your phone, the caller is still there and eventually returns.