http://www.healforceworld.com/Prince-100B.html
Features:• Small and lightweight, very convenient to carry and use• LCD display with backlight• Intelligent fingertip probe with automatic finger detection and automatic power on/off• Accurately measure SpO2• Accurately measure for PR (pulse rate) with beep• PI (perfusion index) display available• Beep alarm for abnormal readings• 2xAAA alkaline batteries power supply with low power indication