Use this head lamp only for jogging and running. Almost always in conjunction with a close-fitting headgear. No slipping. (Was my biggest concern) lamp is very bright. Man can rapidly advancing in the terrain. The lamp itself is a small, ultra-lightweight battery. This can Vedas praktischerwise replaced by normal AA batteries. Battery can be charged using the supplied mini-USB cable. [Life battery performance, I could not fully test, but considers min. 2 hours at full load] lamp is (at least) splashproof, diving, I was still not ;-) beam and light input height is adjustable. Light modes: Lights in power saving mode, light normal, flashing or a small red LED (very weak) to bring to light. When production improvement, I recommend the manufacturers to increase the horizontal height adjustability, so you can continue to light, no extra lifting his head.