>>1821809Check out Light & Motion Vis series. (These were formerly called Urban series.)
Compact, good mounting strap, rechargeable battery. It has amber side lights (just mount the thing so they're not obscured by your wrists), and a not a flashing but a 'breathing' sort of pulse mode. Amazon says IP67, but I've taken them deeper than that while kayaking.
If the battery wears out, you can send it back for service, or lookup how to do it on Youtube (requires soldering). The oldest one I have is from... 2013 I think? I've replaced the battery a couple of times.