Quantity   Component name
1 × Arduino UNO Rev 3 https://www.dfrobot.com/product-610.html
1 × I/O Expansion Shield for Arduino http://www.dfrobot.com/product-1009.html
1 × Heart Rate Sensor https://www.dfrobot.com/product-1540.html
1 × ESP8266 WiFi Bee https://www.dfrobot.com/product-1279.html