Quantity   Component name
1 × Coin Cell Battery Clip BS-3-ND from Digikey
1 × CR2032 Coin Cell Battery
2 × SPST Tactile Button Switch 450-1650-ND from Digikey
1 × 8-Pin IC Socket AE9986-ND from Digikey
2 × 10K Ohm Resistors 1/4 Watt Axial
1 × ATTiny85-20PU Microcontroller
2 × 220 Ohm Resistors 1/4 Watt Axial
1 × Green LED 5mm
1 × Red LED 5mm
1 × Tiny AVR Programmer (or other ATTiny-compatible programmer) PGM-11801 from SparkFun or Digikey