Fitted with a large, bright and easy to use display, the NT1A Handheld Pulse Oximeter is compact, extremely lightweight and durable. It ships with a long list of extensive features to include adjustable data output and alarm limits, visual/audible alarms, ideal for continuous monitoring or spot checking and pediatric and well as adults, 0?100% measurement range, 70%?100% accuracy, visuals indicators and displays, variable brightness green LED, green power indicator light, blinking res low voltage indicator, red low perfusion indicator, indicates pulse rate, requires four standard"AA" Size Batteries, disconnect sensor alarm, key pressing and pulse beep indicators, compliant with EN 60601-1: 1990+A1: 1993+A2: 1995+A13: 1996 safety standards and weighs 195 grams with batteries and 100 grams without batteries.