Quantity   Component name
1 × PCBWay Custom PCB
1 × Arduino Nano R3
1 × NodeMCU V3 LoLin ESP8266
1 × MAX30102 Pulse Oximeter and Heart Rate Sensor
1 × MAX30100 Pulse Oximeter and Heart Rate Sensor (Optional)
1 × SSD1306 OLED 128x64
1 × 5mm Common Anode RGB LED
1 × Button (6x6)
3 × Resistor 220 ohm
1 × DC Power Connector, Jack
1 × External Battery