- Some wire (both solid core and stranded) and heat shrink to match. - One Gemma. - One single Neopixel mounted on a round board - One Neopixel ring (16 neopixels). - One 1000 uF capacitor or larger (larger is actually better, due to tolerances. Smaller will cause strange flickering as colours change. If you don't ever change the colours, then you can probably omit the capacitor altogether.) - One 300-500 ohm resistor (anywhere in that range). - One switch. I'm uploading multiple STLs for different switches, and a plain one you can cut/drill yourself. - A push button for the flashlight. Sorry, no part number. It came in a kit and is pretty common. I’ve seen them for sale in automotive sections in brick and mortar stores. - 150 mAh lipo battery with charger (Adafruit). Project is sized for this battery. - optionally, some better JST connectors. I used Digikey part numbers 455-1648-ND, 455-1133-1-ND, and 455-1183-ND - yarn for the necklace part, if desired