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Secret Code Keychain by


What does that say? Well, that’s part of the fun! Each side has a different coded message. Drive your friends wild as they try to figure it out.

Amaze your friends and neighbors with this circuit board keychain that lights up when you plug it into a USB port.

The fiberglass circuit board is 1.5” tall by 0.5” wide and 64 mils thick. It features metal pads in numeric shapes and 8 mil traces that are disguised but not concealed beneath a green solder mask. One side of the board displays a message in binary code and 2 yellow LEDs. The other side of the board is another message in binary and 2 current limiting resistors.

The circuit board hangs from a silver-toned chain and latching loop. The latching loop opens such that you’re not restricted to using this as a keychain – You could also clasp it onto your bag or name badge.

This design is available in: keychains, necklaces, earrings, and magnets.

This Keychain is an ideal way to show pride in one's techie skills or those of a loved one.

Check out our store for flash drives, circuit boards, and more!

All metals and solders are lead free, RoHS compliant, and safe for daily use. Every item is soldered and assembled by hand, thus each piece contains minor variations.
We can ship outside the United States! Contact us to find out about additional International shipping rates.

Secret Code USB Circuit Board Keychain

$12.00 USD
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  • Handmade item
  • Ships worldwide from Texas, United States
  • Feedback: 192 reviews
  • Favorited by: 75 people