I bought this reticulum laser for an upcoming large area tiling. Delivery was on time and the device looks good, BUT! - there were absolutely ZERO instructions/information. Luckily, the device is fairly easy to use, but there are certainly features that need explaining, e.g. B. outdoors. I still don't know what that button means, but I don't plan on tiling anyone's driveway anytime soon, so I'll have time to get online and find out. I deduct a star for that. The green light is definitely easier to see than the old red light laser I've used in the past. This is a 360 degree laser and there is no shielding on the lasers so they can project in all directions allowing you to use this laser on walls, floors and even ceilings. This makes it impossible to completely avoid accidental eye contact with the laser, so I put a piece of tape over the lenses to prevent light from propagating in a direction I'm not currently using. This device has the ability to turn each of the three layers on and off independently, but they always transmit in a 360 degree arc. Annoying at times, but for the price and versatility of this device it doesn't really matter.