Quantity   Component name
1 × [prototyping] SparkFun RedBoard https://www.sparkfun.com/products/12757
1 × Adafruit Pro Trinket – 3 V, 12 MHz https://www.adafruit.com/product/2010
1 × 20 mm 8×8 red LED matrix (Seeed LED201A5B / Wuxi Ark SZ410788R) http://www.seeedstudio.com/depot/20mm-88-square-matrix-LED-Red-p-36.html
1 × Adafruit Pro Trinket LiIon/LiPoly Backpack Add-On https://www.adafruit.com/product/2124
1 × Lithium Ion Polymer Battery – 3.7 V, 150 mAh (or similar) https://www.adafruit.com/products/1317
1 × watchband big enough to contain the battery
1 × [to start] button to activate the display
1 × [to start] cadmium sulfide photoresistor for ambient light brightness adjustment
1 × [later] SparkFun RGB & Gesture Sensor - APDS-9960 https://www.sparkfun.com/products/12787