Quantity   Component name
1 × Atmel ATTiny85 microcontroller to initialise the display
1 × oled screen at 128x32 pixels to display the falling tetris blocks
1 × LIR2032 rechargeable lithium-Ion battery power the project with 3.7V and 20mAh
1 × Coin chell battery holder make coin cell fast swap possible
1 × Switch bring current to 0 when earring is not in use
1 × dot grid prototyping pcb minimise 3D soldering