Roscoe OTC Fingertip Pulse Oximeter Includes Lanyard * The Roscoe OTC Fingertip Pulse Oximeter allows you to monitor and maintain pulse and oxygen saturation levels on-the-go * Accurate and fast oxygen level and heart rate measuring technology is ideal for sports enthusiasts during strenuous activities or mountain climbing * Recommended for spot-check monitoring only* No prescription required * Approved for over-the-counter retail sale Large easy-to-read display * Soft silicone padding for a comfortable fit * One-button operation * Up to 30 hours of use with batteries * Auto-off function * Low-battery indicator * Manual lanyard and two AAA alkaline batteries included * Attractive retail packaging * One-year limited warranty Dimensions: 2.25 L x 1.25 W x 1.25 H Weight: 0.1 lb (including batteries) Display Type LED Display Range: 0 - 99% Measurement Range: 0 - 100% Resolution: +/-2% for SpO2 Operating Temperature: 41-105¯F (5~40¯C) Storage Temperature: -4 -131¯F (-20~55¯C) Ambient Humidity: -15%-80% in operation; < or = 93% in storage