Nowadays it has become very important to monitor some vital parameters through the use of wearable devices and to save these data on external devices such as mobile phones or tablets.The purpose of this thesis is to study and create a wearable instrument similar to a bracelet able to monitor the electrocardiogram (ECG) through a one lead measurement and the blood saturation (SpO2) through an integrated optical module given by Maxim IntegratedTM. All data sampled by the device,can be exchanged via Bluetooth® on a mobile App to have the possibility to process them and present results to the user in an easy way in order to facilitate their reading.