The SpO2(Pulse Oxygen Saturation) sensor uses two emitting LEDs, one in the red region and the other in the infrared region of the spectrum. It uses red and infrared light sensors to detect your oxygen levels, sensing changes in those levels. It measures the volume of oxygen based on the way the light passes through your finger and delivers the data to the device's screen, which will tell you the percentage of oxygen in your blood with +/- 1% accuracy. Product Categories: Monitor accessories Place of Origin: Henan, China (Mainland) Brand Name: Datex Cable Material: Medical TPU Cable Length: 3M MOQ:1pc Warranty: 12 months Port:Shenzhen port, or as you need Feature: Latex-free, double shielded, antistatic, low noise Paypal Supply Ability:1000 Piece/Pieces per Week Payment Terms:L/C,D/A,D/P,T/T,Western Union,Money Gram Delivery Time: 3-5 days Shipping: DHL/FedEx/EMS/UPS/TNT Packing: 1pcs pack into one PU bag, then pack inside a small carton box.