The device is made of plastic and feels well made. The button is rubber and feels like it will hold up to some abuse. Once placed on a finger simply press the button and it will turn on. It is that easy to use. pressing the button will then cycle through the different views. Throughout my testing it seemed to be accurate and fairly consistent. This is not going to be as good as the ones used in the hospital but should work perfect for keeping an eye on your health from home.
If you are interested in purchasing the Easy@Home Areta Fingerti Pulse Oximeter it can be found here.