The lamp I have been around for years, there's never been penetrated water. The batteries last for a long time and felt if you are more than 2 buys at a time even cheaper. The same lamp with rechargeable batteries would be the maximum, and a reason to create for me my successor directly. The environment will thank me. The light is nice and bright and you will also laterally well wahrgnommen. They can and break down in a matter of seconds what I'm doing if I let a long time my bike unattended. Buy recommendation on my part