Quantity   Component name
1 × ssd1351 1,5" color OLED breakout board (with microSD) ebay seller: Wide.hk has those
1 × 3D printed casing (or print yourself) needed as a neat enclosure
1 × 500mAh battery max dimensions: 45MM x 36MM x 3MM
1 × Zerowach core board custom designed Zerowatch mainboard by Attomsoft
1 × 22MM watch band with pins to attach it to the watch
1 × [optional] HC06 bluetooth module i only recommend this if you really need bluetooth in your watch.