Quantity   Component name
1 × Adafruit Trinket 3.3V http://www.adafruit.com/products/1500
1 × 16 Neopixel Ring http://www.adafruit.com/products/1463
1 × Tactile Button http://www.adafruit.com/product/367
1 × 3xAA Battery Pack
1 × Chest Strap I cut off the waistband of an old pair of boxers. Classy.