CONTECT CMS50ED pulse converter uses photoelectric oxyhemoglobin inspection technology. This is a small yet very versatile device to measure the pulse oxygen saturation and pulse rate which is being done through your finger. Highly recommended for families, hospitals, oxygen bars, community healthcare, sports, etc. It features SpO2 prove integration and processing display module. Very convenient to carry around due to its small and lightweight design. Very easy to use with very long battery life, multiple display values available and can be changed along with the screen brightness. Make sure that the device must be used before or after sports activity as the data will not be properly gathered while in the middle of a sport activity.