The Yamind Wrist, Pulse Oximeter Rechargeable Oxygen Model With App is an excellent tool for measuring your body's oxygen levels. It is ideal for use in emergency medicine, family medicine and more. The device features a rechargeable battery and comes with a companion app that provides additional data analytics. The model is available in a sleek wrist format which makes it easy for you to take it with you wherever you go. It's a useful tool for anyone involved in healthcare, cardiology or biological laboratory work. Best on the market. Look on Amazon and see the price difference.