It doesn't work on the h300 I have, anything that touches the contacts sparks wildly. I found this out using a pocket knife to remove some lint. It also causes stuff to corrode if it gets sweaty because it's just plating out material onto the center post and that's inherent to having the charging circuitry in the cable. It's a startlingly shit design, I'm not buying anymore USB chargeable lights unless it's a covered type C port.