I bought this for very occasional around the house type of use so the fact that it uses removable AA batteries instead of an expensive rechargeable lithium is a plus since it will be dormant for long stretches of time. It's first mission was to help me excavate a kamikaze mouse that snuck into the house and entombed himself in a wall like an Egyptian mummy, except I doubt mummies stunk that bad. Anyway, after my dog showed me the approximate location of the perp, I made an observation hole about the size of a hammer head... well, exactly the size of a hammer head, and snaked the probe right in to quickly pinpoint the location. The four dedicated buttons make this tool extremely easy to use, it is plenty bright and the picture quality is better than I expected, plus you can rotate the picture if need be. The instructions are simple and easy to follow and also include a valuable safety tip that I have never seen before: "Do not use this device for personal inspection or medical use in any way."