Features:1. Accurate, fast and reliable: fingertip pulse oximeter can accurately test in less than 8 seconds.2. Detachable box for use to protect the device when not in use, lanyard, convenient to use as a wrist strap or wear on the neck.3. Sports enthusiasts: For pilots, sports enthusiasts, skiers, cyclists or high-altitude rock climbers, it is a reliable companion for quick and easy reading of oxygen saturation.4. Good quality: This product is made of high-quality materials, exquisite workmanship, very good quality and long service life.5. Portability: This product is small in size and light in weight, very convenient to carry around.Description:Designed for sports and aviation enthusiasts, can be used as a heart rate monitor, does not take much space and can be easily taken away.Specifications:Color: blue+whiteMaterial: plasticBattery: 2 AAA batteries (not included)Package Included:1 pc*oximeter1 pc*sling1 pc*manualNotes:1. Please allow 0-1 inch error due to manual measurement. Thanks for your understanding.2. Monitors are not calibrated same, item color displayed in photos may be showing slightly different from real object.