The Panodyne S-400 Pulse Oximeter is a light and portable fingertip device featuring a long battery life. Measuring pulse, blood oxygen and perfusion index this handy monitor has a short measuring time but accurate results.The Colour OLED display auto-rotates so you can easily read your results, and there is also a battery life indicator. To save power this Pulse Oximeter shuts down automatically when not in use. It also features an 8-hour sleep monitoring and recording system.