I have yet to try them for a long shift on my feet nonstop, and I can update this review if I get the opportunity. The phone screen shows "charging rapidly" when charging. These are fit on great. I highly recommend it to anyone looking for a high-quality, compact speaker. They fit flush with both my Dre Beats - Studio and Bose over ear headphones. Will test for a while, but will return if not satisfied with performance or quality of sound. The eartips are made of soft silicone and feel pleasent in the ears. Only problem I have had is that earlier this week when I went to open the case to put them in for charging, the whole inner part came out. Im on my second pair of these. Highly recommend this item :-)