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The basic laser tag system packing consists of three main pieces.
The laser tag gun contains 4 main components (1) shooting LED, (2) photodiode, (3) hit indicator LED, and (4) the trigger.
If you are interested the laser tag gun is a modified nerf gun that had a low power spotter LED. The nerf dart portion was removed, the low power LED was replaced with a high power LED, and wiring connections were added. Here is a picture of the internal gun wiring .