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