Great for athletes or anyone who wants to keep track of their oxygen level. DRIVE Clip-On Style Oximeter Portable, non invasive spot check of oxygen saturation of arterial hemoglobin (SpO2) and pulse rate. Clip-on makes it easy to accommodate larger fingers and to position on finger. Small and lightweight. Comes complete with a lanyard and 2 AAA batteries for your convenience. Provides a fast and accurate reading. Large color display is adjustable in 2 positions and is easy to read day or night. Uses 2 AAA batteries (alkaline or rechargeable). Can be operated continuously up to 30 hours with normal operation. Low voltage indicator. For home or hospital use.