Quantity   Component name
1 × Reed Switch <a target="_blank" rel="noopener noreferrer" href="https://www.sparkfun.com/products/8642">https://www.sparkfun.com/products/8642</a>
1 × Arduino Pro Micro (5v) <a target="_blank" rel="noopener noreferrer" href="https://www.sparkfun.com/products/12640">https://www.sparkfun.com/products/12640</a>
1 × DC Barrel Power Jack/Connector <a target="_blank" rel="noopener noreferrer" href="https://www.sparkfun.com/products/119">https://www.sparkfun.com/products/119</a>
2 × Neopixel through-hole 5mm <a target="_blank" rel="noopener noreferrer" href="https://www.adafruit.com/product/1938">https://www.adafruit.com/product/1938</a>
1 × 100 Ohm Resistor
1 × 3x AA Battery Pack with DC Barrel Jack <a target="_blank" rel="noopener noreferrer" href="https://www.adafruit.com/product/3842">https://www.adafruit.com/product/3842</a>
20 × 15 x 6.5 x 3 mm tiny magnets