Quantity   Component name
1 × PulseSensor - Open Hardware heart rate sensor http://pulsesensor.myshopify.com/collections/frontpage/products/pulse-sensor-amped
1 × 3D printed Case
1 × Arduino Pro Mini 3.3V 8mHz for easier integration of the NRF or 5V 16mHz with voltage regulator.
1 × NRF24L01+ 2.4GHz Transceiver Wireless Transceiver Module
2 × 6x6mm cylindric neodymium magnets
1 × 4 DIP switch Electronic Components / Misc. Electronic Components
2 × Red LED 7x5x2mm Electronic Components / Misc. Electronic Components
1 × Yellow LED 7x5x2mm Electronic Components / Misc. Electronic Components
1 × Green LED 7x5x2mm Electronic Components / Misc. Electronic Components