I bought these as a gift, the person I gave them to said when trying to speak on the phone it was very unclear and hard to understand. We drove in the pouring rain for hours and all stayed dry. I am pretty solidly a size 7 1/2. Came a little knicked up. I CANNOT RECOMMEND THIS DESIGN EXCEPT FOR SPECIFIC INSTALLATION VIBRELLI DETAILS. It tells me how long the workout lasted, calories burned, how many ?miles? I went, pace, average heart rate, and heart rate details (how long in certain heart rate zones). Being able to toggle the colour of the Caps Lock and Num Lock keys when pressed is a great example of how this would be used. Although, I am able to utilize the the lights. they were a size 6. My son really likes the four bright lights that tell him how much charge is left.