Sleep tracking update: Withings Pulse fail Posted on 2013-10-26 by megan OK, that’s the second time in two weeks my Withings Pulse has pulled off my wrist at night. Not worth my while when I have another no-hassle tracker to wear. I shouldn’t be surprised. It appears to be a non-Velcro hook-and-loop fastener. This doesn’t look like Velcro brand.