The iHealth Air connected pulse oximeter is a high-quality professional device that can be used at home. All you need to do is place your finger inside the pulse oximeter to check your vital signs, which are displayed on the screen including the level of oxygen in your blood (SpO2), notably for asthma sufferers, your pulse and your perfusion index. Connected health, designed for use with smartphones and tablets via the free app. One button operation. Batteries required: 1 x Li-Ion batteries included.