SPO Check Mate CM1000 answers the sports and aviation markets? demand for a lightweight, inexpensive monitor for measuring SPO2 oxygen saturation and heart rate during physically active and high-altitude activities. The SPO Check Mate finger pulse oximeter offers the user a greater ability to monitor these vital signs under motion and is less expensive than most available devices. SPO Medical's patented reflectance pulse oximetry (RPO) technology is what allows the SPO Check Mate finger pulse oximeter to effectively monitor an athlete?s SPO2 (oxygen saturation). SPO Check Mate finger pulse oximeter will monitor SPO2 in almost any physical activity that does not include significant arm swinging (e.g., jumping jacks). For most athletes, a little learning goes a long way: after a few hours of experimenting with various movements, athletes quickly learn how to use the SPO Check Mate in almost any activity. Features: Can be used outdoors in many conditions, including high altitudes, at high and low temperatures, and even in the dark. Soft rubber boot sensor keeps it in place even while you are in motion. Can be used while in Motion Battery Life Indicator Superior Battery Life (1000 hours) Auto ON/OFF Weight: 1.8 Oz. (50 Grams) including Battery Digital LCD display for SpO2 and pulse rate with BACKLIGHT 2 year Manufacturer's warranty Specifications: Saturation: 40-99% Heart Pulse rate: 40-250 beats per minute (bpm) Resolution: 1 digit Power Requirements: 3.6v Lithium Battery, 1/2 AA size Battery Continuous Life: 1000 Hours, 40 Days Continuous Usage Operation temperature: 4oC to 42oC Storage temperature: -20oC to 70oC Operating humidity: Up to 95%, non-condensing Weight: 1.8 oz. (50 gr.) including battery