Gadgets That Track Your Body’s Vital Signs

• Many new fitness-tracking devices are on display at the Consumer Electronics Show in Las Vegas. 
• Monitor your activity and health 
• Precisely detects blood oxygen level

• The iSpO2 clips onto a finger 

    and measures the amount of oxygen 

    carried in blood

• shines both infrared and red 

    
    light into the digit

•  blood absorbs different 

     amounts of each depending on 

     how much oxygen is carried by red blood 

   

     cells.