The next generation in handheld pulse oximetry - is a small yet versatile digital pulse oximeter designed to accurately assess oxygen saturation and pulse rate * Compact size - 7.4 oz. unit for easy handling * Simple - Easy 2-button operation * Flexible - Uses 4 1.5V AA size alkaline batteries or optional rechargeable battery pack or AC power (charging stand) * Powerful - Memory for 72 hours of data storage * Compatible - Works with Nonin