Quantity   Component name
1 × ATTINY85-20PU Microprocessors, Microcontrollers, DSPs / ARM, RISC-Based Microcontrollers
8 × LED 5mm round yellow (through-hole)
1 × IC Socket DIL 8 (optional)
1 × Slide switch (mini) through-hole
1 × CR2032 battery holder
1 × CR2032 battery
1 × PCB from JLCPCB made in EasyEDA