Features:Lightweight for carrying and easy to use.Manually adjust the direction of interface.LED display，simultaneous display for testing value and bargraph.Low battery voltage indicator.Automatically standby or sleep.The display interface of “LED”can rotate two direction after pressing the key for less than 0.5s.This product is suitable for the hospital，oxygen bar，sport health (using them before or after sport，do not advising using them during the movement)，and community health care，etc.Package Content: 1 x Fingertip Oximeter1 x Lanyard1 x English user's manual