Quantity   Component name
1 × Adafruit Feather 32u4 <a target="_blank" rel="noopener noreferrer" href="https://www.adafruit.com/product/2771">https://www.adafruit.com/product/2771</a>
1 × Pulse Sensor <a target="_blank" rel="noopener noreferrer" href="https://www.adafruit.com/product/1093">https://www.adafruit.com/product/1093</a>
1 × 3D printed Casing Made of one of the next materials
1 × NinjaFlex Filament If you plan to implement the sensor on the socket of the prostesis or make a band to hold it.
1 × Battery Lithium Ion Battery Pack - 3.7v 4400mAh of Adafruit <a target="_blank" rel="noopener noreferrer" href="https://www.adafruit.com/product/354">https://www.adafruit.com/product/354</a>