Quantity   Component name
1 × 940nm IR LED
1 × ESP8266 based development board
1 × 68 Ohm resistor
1 × NPN transistor
1 × 330 Ohm resistor
1 × CR2032 battery holder
1 × CR2032 battery
1 × Perfboard optional
1 × Breadboard optional
1 × M/F Jumper Wires optional