Step 4The wiring
The next step will be to secure wire to your two button cell batteries with electrical tape. DO NOT SOLDER THESE BATTERIES, THEY EXPLODE! Next solder the two negative leads of the LEDs from the board to the two sides of the 3-way switch.
After that, solder the Positive lead of the battery to the power switch, and the negative lead to the middle of the 3-way switch to complete the circuit!
Good luck lighting up dark places!
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