It works. FYI: The reflector target is large, so for a more accurate count on smaller parts just tape off 75% of the reflector surface.

When products pass the beam it may double count the item. My items to be counted were curved,like 2 oz eye dropper bottles. I assume maybe this is only meant for box counting.. Since the description stated conveyor belt the assumption was it would count anything, round or boxed.. That was not the case..

it is difficult to put together and does not include screws. I wish I would have known it needed to be set-up before purchasing this item.

Wired it (several times), plugged it in to the 110VAC mains (several times), would not energize.

Update: Returned the faulty unit, ordered another, which works fine. Updated to 2 stars for a 50% (rather than 100%) failure rate (in my experience).

This product only includes the main components. Note too that this is an infared beam and sensor, so you won't be able to line up the sensor and the reflector except by eye (the beam is invisible). Used for a 'people counter' at a library to replace an older unit that failed.

Added a steel project box to hold the counter, a 1/8 inch steel angle bracket length to mount the reflector on a door jamb so that it would not move; cord grip for the power cord where it passes into the box; 50' of 3 conductor 22 awg cable for the run from the project box to the sensor; a small plastic junction box within which I spliced the cable to the sensor near where the sensor was mounted; and a three wire mic jack and plug to connect the sensor cable to the project box. All told spent about $80 and a fair amount of labor (mounting the sensor/reflector, cutting the project box, running the cable. Best part was that I'd lined it up by eye and it picked up the signal the first time it was powered up so I didn't need to shim either the reflector or the sensor. Soldered all connections.