1.Lightweight: for carrying and Easy-To-Use outdoor. 2.Real-time spot-checks: Datas storing and data analysis function. 3.OLED display: simultaneous display for testing value and plethysmogram. .️ MEDISANA pulse oximeter PM100 [WARRANTY 3 YEARS] The pulse oximeter PM 100 measures blood oxygen saturation levels and heart rate reliably and accurately. Both of these readings can be viewed on the well-readable OLED display in four different views as a bar graph or in wave form. The pulse oximeter PM 100 is a practical everyday companion not only at home, but also on trips, thanks to its convenient "one-touch" operation. German Tech ️ OXITECH Pulse Oximeter [WARRANTY 1 YEAR] Oxitech Pulse Oximeter is intended for non-invasive measurement of SpO2, Pulse Rate & Pulse intensity. This product comes with a 1-year warranty. ️ CA-MI O2 [WARRANTY 1 YEAR] CA-MI O2-Easy Finger Pulse Oximeter is intended for non-invasive measurement of SpO2 & Pulse Rate. This product is made in China & comes with a 1-year warranty.