As a good golfer, it is essential to know how far the next shot actually has to be. This laser helps immensely. The distances I measure with them almost always agree with the devices from K&F Concept or similar, and as already described here, the differences mostly come from rounding errors. It is crucial to know that you should always use the same equipment, regardless of whether it is training, at home or abroad. With always the same device you always get the same distances. Handling the laser is very simple: look in, press the button and when the target appears, aim at the flag (or other target) and you will see the distance. What impressed me is that the laser also works perfectly in the rain, backlight (sometimes a problem for others) and fog. I've never had any problems finding the correct distance and actually play in (almost) any weather. Regarding the battery: I play quite a lot and therefore the laser is used quite a lot. After almost a year, I still haven't had to change the battery... If anyone is interested in a laser, they should definitely take a closer look here, the price is unbeatable in terms of performance.