Laser is super bright most of the time. Sometimes, though, it turns on at full power but then get dimmer as you use it. I would say that about 50% of the time it does this. No idea why, as it has brand new batteries and has never been dropped or mistreated.
Bought 2 in case installation went awry with the first one, or just to have a backup for the future. For the price, these are top-notch! Great clarity, great protection! Install using water with a SMALL amount of soap- apply to the back side of the protector, place protector on device, use a credit card or other hard object to "squeegee" out the water, and it's flawless!