Quantity   Component name
1 × LED Matrix & Controller Often called "MAX7219 Dot Matrix 8x8 Led Display Module MCU Control" or similar
1 × ATtiny85 Microprocessors, Microcontrollers, DSPs / ARM, RISC-Based Microcontrollers
1 × 0.1uf capacitor decoupling cap
1 × Mini LM2596 3A DC to DC Adjustable Step-down Voltage Regulator Buck Converter Module
1 × 6×6×5mm Tact Tactile Push Button
1 × 9v battery
1 × 9v battery clip w/leads