The best just got better. Nonin, the world leader in fingertip oximetry, has designed years of clinical experience into the Onyx 2 9550 pulse oximeter. Nonin, the world leader in fingertip oximetry, has designed years of clinical experience into the Onyx 2 9550. The electronics and sensor are incorporated into the world's smallest fingertip pulse oximeter, providing a cost effective solution for spot-checks and short term monitoring. Onyx 2 9550 – not just a new look. Superior performance and unparalleled reliability put vital signs within reach anywhere, anytime. Not just a new look - the Onyx 2 9550 offers: Simple operation for fast, easy spot-checks Superior accuracy and durability Free protective case A new efficient turn off mechanism (2500 spot-checks or 21 hours of continuous use) Cost effective design does not require a sensor; and An enhanced product design - enclosed spring; smaller; wider viewing angle; easy battery access 2 Year Warranty!! Oxygen Saturation Range (%SpO2) 0% to 100% Pulse Rate Range 18 to 321 pulses per minute Numeric Displays Two 3-digit LEDs, 7 segment LED (light emitting diodes) Pulse Strength Tricolor LED segments Measurement Wavelengths Red 660 nanometers Infrared 910 nanometers Accuracy Blood Oxygen Saturation (%SpO2 ±1 SD) 70 - 100% ± 2 digits Pulse Rate 20 - 250 bpm ±3% Temperature Operating +32° to +122°F (+0° to +40°C) Storage/Transportation -22° to +122°F (-30° to +50°C) Humidity Operating 10% to 90% noncondensing Storage/Transportation 10% to 95% noncondensing Altitude Operating Altitude Up to 40,000 feet Hyperbaric Pressure Up to 4 atmospheres Power Requirements Two 1.5 volt AAA-size batteries Battery Life Operating Approximately 21 hours of continuous operation Storage 4 years, minimum Dimensions 1.31 x 2.22 x 1.27 in. (3.32 x 5.63 x 3.22 cm) Weight 1.89 oz (53.5 g) with batteries Warranty 2 years