Make your own health and fitness monitoring project with this heart rate monitor sensor kit. The compact board measures the electrical activity of the heart via three ECG electrode sensors, then filters and amplifies the analogue signals so that the heartbeat can be charted as an ECG or electrocardiogram using your Arduino or similar microcontroller. Powered by 3.3V. Kit includes the heartbeat sensor board, 3 x adhesive ECG pads and a colour-coded connecting cable. A 12-pack of spare adhesive ECG pads are available separately (XC3785).