unisex adult Compact Competition Electronics Indoor Light System CEI 4100, White, one size US

Definitely helps out with indoors. I have a toy hauler and am able to set it up and shoot my hoyt bow inside and clock the the speeds for my arrows. Definitely need this attachment for indoors. Worked like a charm.

Even though this isn't the same brand as my F-1 Master Chrony I took the chance it would be compatible. It works great, like it was made for it, and it's a great substitute for the Shooting Chrony light kit and a lot cheaper. It's got a infra-red LED design and the only indication that it's on is a single red LED on each light arc. Each light arc is one piece and plugs only on one end so you got to make sure that the plug-in side is on the same side to hook up the Y power cable. It only comes with a 120 volt AC adapter but it says you could use a battery source although they don't offer one so I assume that they want you to buy a generic or make one but since I use this for air rifles indoors I'm not far from an A/C outlet. Overall I got to say that this was a great buy.

This fills in where the diffusers fail, and with today's indoor lighting (LED, fluorescent) having some natural flicker, this is the only way for a chronograph to work well inside.For awhile, I used a couple of LED flashlights, taped to the diffusers. They have to be on high power, so that there's no flicker. (LEDs reduce light intensity by varying the duty cycle --> controlled rate of flicker) But this was hit or miss; only worked maybe 60% of the time.This light set uses infra-red LEDs, which the user can't see. We only see the red LEDs lit to let us know they're on and working. Now, the chronograph works 100%, better than it does outside even! There's no point in bringing the chrono to the range any more. This should be offered in a deluxe package with the Pro Chrono, like Caldwell does with their system.

Works as expected

The media could not be loaded.  Tried with additional UV led strip before for indoor measurement with no luck, then the kit came, installed, and work like a charm. Any purchase for Prochrono should consider this kit!

I bought this item for indoor use . I have a cladwell chronograph small green one for 100 bucks that does not come with a light kit.Open the package had 2 light bars and power supply. Great price vs the light kit that I wanted for this system. And tested it with a red ryder bb gun super close range and wow readings on the first round and round after round . Can't wait to test pistol & rifle rounds.If your having reading problems with your crono then this is the product you need.

I recently bought a new chronograph and wanted to use it indoors to test airsoft guns. No matter what lighting I tried (even in an enclosed unit with overhead lights) I just could not get it to read shots. This solved my issue instantly. My only gripes are the price and the fact that the lights don't run off of batteries, making it not portable. This is honestly laughable since the chronographs its designed for run off of batteries...There's also numerous IR/laser products that run off of batteries so don't know why it's not the case here. It loses a star because of this.

It amazing how well these work. I've even gotten reliable results when I've forgotten to turn the fluorescent lights off. There are a total of 72 infrared (invisible to us humans) LEDs in the bars. If your digital or cellphone camera (you might have to use the selfie cam) can see the transmitter on an IR remote control when you push a button you can use the camera to verify these lights are working. Set the lighting system up in a darkened room, move the camera close and you should be able to see the LEDs. I've included a picture I took with an ordinary Sony camera.I should never have wasted my time trying to create a homemade substitute!

This fits the prochrono perfectly and has the same length as the outdoor rails. The built-in LED lights are actually infrared, so you won't see bright light when you plug the unit in, as I would have expected. There are two small red indicator lights to let you know the unit is on.If you are looking at this product, you are likely debating between dropping $90 so that you can use your chrony indoors, or jerry-rigging your own solution. I actually tried jerry-rigging route first. I bought those led strips that you mount behind your television, at an eighth of the price, and what I found is that no matter how you position these lights, they don't actually help the chrony at all. Then, I had marginal success mounting my prochrono on a tripod (rather than resting it on a table), and bringing it higher to my basement pot lights - using the maximum height of the tripod. When I shot RIGHT across the sensors (almost grazing them) the chrony worked. However, I wanted a better solution, so I finally invested in this product. It is pricey for what it is, but it does the job. What I paid on Amazon with prime shipping was cheaper than whatever other prices I could find online (go ahead, do the search).The construction of each rail is a clamshell-like plastic casing - nothing fancy. I found it interesting and perhaps counter-intuitive that the seam between the two plastic halves run along the bottom edge where the lights are (as opposed to the sides). I find this counter-intuitive for two reasons: 1) this is where the IR light is supposed to shine through, and ideally even though the bottom edge acts as a diffuser, would cause erratic aberrations in the way the light shines through, and 2) the female holes where the rods are inserted literally have gaps where the plastic comes together. The plastic seam along the bottom has some rough finishing, with messy occasional tabs that give a dollar-store child's-toy look to the product.Regarding functionality, the IR lights allow me to shoot in the dimmest room in the basement - they work as promised. The prochrono still needs to be lined up perfectly with the target, and even so it doesn't register every shot, there is still the occasional error. So don't expect perfection.Finally, the product could do with a power switch, rather than having to unplug it to turn it off. I will probably add one.I was initially disappointed that the prochrono needs this accessory for indoor shooting; really, it could have come with a lighting kit. This product couldn't have been expensive to produce. However, it is what it is, and if you can't get your chrony to work in your basement, this is still worth buying, keeping in mind the points I have mentioned above. If you decide to try making your own lighting kit, try mounting a pot light above the chrony first, or moving it to a pot light so that both rails get as much light as possible. So now I have a chrony that works well in my basement, and a TV that is nicely backlit, all for under $100.One year update:One of my rails had a dead zone in the middle. About 5 or 6 IR LEDs were not lighting up. I figured this out firstly because the unit stopped working, and secondly my son luckily had these cheapo spy-gear night vision goggles with built-in infra-red camera. I was able to revive the rail by opening up the white clamshell case and re-soldering the terminals of the surface-mounted dead LEDs. Perhaps the original soldering lifted off because the circuit board is constantly under strain as it is curved. The problem was annoying, but easy enough to fix, and I haven’t had problems since. Perhaps this could help someone, provided they have the same toy lying around at home.