Quantity   Component name
1 × esp8266-01
1 × I2C oled display SD1306 128x64
2 × 5.1k resistor
2 × button
1 × 3.6V LIR2032 battery
1 × clip for lipo battery
1 × switch Development Kits, Boards and Systems / Development Kits and Boards
1 × perf board 26x10 holes