The Zacurate Pro Series 500DL fingertip pulse oximeter is manufactured according to the CE and FDA standards set for pulse oximeter designed for sports enthusiasts, pilots or anyone who wants to obtain their SpO2 (blood oxygen saturation levels) and PR (Pulse Rate) on the go. The pulse oximeter LED display now faces the user so that the user can read it easily. We have also upgraded many internal hardware and software components of the pulse oximeter. For example: the pulse oximeter can now display SpO2 up to 100%! Taking a reading is easy, just clip it on to your finger and turn it on at the press of a button. The large LED display makes viewing the results a snap. Its small size makes it easy to carry around and a lanyard is also included for added convenience. Comes with 2 AAA batteries and a silicon cover to protect your pulse oximeter from dirt and damage. Zacurate is a registered trademark of USPTO. We will actively and aggressively pursue any parties who infringe on our intellectual property rights to the maximum extent allowed by the law. Beware of Imitation, Buy Original. Zacurate Pulse oximeter is designed in USA. This device is for Sports & Aviation use only and is not a medical device.