Totally functional, compromise between the hornady and the t1000, but it's not perfect. - Caldwell Flash Bang AR500 Steel Target Hit Indicator

Gets the job done but it's not perfect.

I like the green flashing over red and it has a decent FOV so you don't have to worry about aiming it towards the shooter/scorer. The electronics are super simple with a single IC to control the LED timing and to monitor the tremble/vibration switch. There isn't an accelerometer or fancy firmware, just a little spring switch that completes a signal circuit when there is a little vibration. I'm shocked they managed to get a patent for this

Honestly, it's $8-$12 in parts, plus the plastic housing and accessories. I suspect they're making quite a good margin on these. Which makes it a little hard to accept that they didn't put a 10c gasket in it to make it water resistant.

The Hornady is obviously a repurposed bike taillight, so I bet it has some water sealing, and it's priced closer to the real BOM when you buy the bulk pack. Smart of them to save on design costs when a waterproof and rugged case and LED light are available from an OEM ready to go.

Overall, I'm happy with the unit and will probably pick this one again over the Hornady unless I was going through one or two a month from stray shots.