While the product does exactly as it is advertised, in practical application, it is difficult to use. If your vehicle has a completely flat hood and dashboard top, it might be easier to use; however, unlike a tennis ball hanging from a string, it's quite tricky to line your car up as you try to get the beam to an exact spot on your dash or other chosen spot. I purchased the dual laser unit for our 2-car garage. In hindsight, I might have been better off with 2 separate single-laser units ... because they could have been placed directly over the spot on each car that were chosen. With each beam at an angle, it seems like aligning each car is more difficult because the beams move considerably as they shine on parts of the car that are higher or lower. With a single beam pointing straight downward, driving to a specific spot would have been easier. (I have removed the unit, and will be re-installing it further forward in our garage - so that at least the beam angle will only be at a horizontal angle, not a horizontal and angle forward toward the back of the garage.
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