Power: yes, and is recognised by Garmin as a power meter. "Up to 16 hours" must be with the headset on, with no sound. Liked that the waist was elastic and adjustable with tie. I live in Hawaii where regular shoes are rarely worn. These shoes were comfy from the moment I put them on. These are yeezys look alike 😍 This is a good product, very sturdy, but it suffers from horrible packaging. had been shopping for underpads and was skeptical about these. The price was right, I know it will get a lot of use. Se ven de buena calidad y durables.