Quantity   Component name
1 × A000088 Arduino Pro Mini 5v 16MHz
1 × DS3231SN Module Clock and Timer ICs / Real-Time Clocks
1 × ADA881 Electronic Adafruit 0.56" 4-Digit 7-Segment Display w/I2C Backpack - RedComponents / Misc. Electronic Components
2 × 1N4007 Discrete Semiconductors / Diodes and Rectifiers
1 × 0.1μF Ceramic Capacitor
1 × RadioShack 276-148 half of a Dual Mini Board with 213 Holes: http://comingsoon.radioshack.com/dual-mini-board-with-213-holes/2760148.html
2 × 12-pin female headers so I didn't have to solder the Arduino to anything
2 × 2-channel screw terminals one for DC input, the other for battery input
10 × M/F dupont cables
1 × 0.14 liter Really Useful Box
1 × 22awg solid core hookup wire
1 × 2.1mm DC input