Pulse oximeter is a very important and common device to check oxygen
saturation (SpO2) and pulse rate. As a small, compact, simple, reliable and
durable physiological monitoring device, Fingertip pulse oximeter is widely
applied in clinic, hospital, social medical organization, first aid etc.
Operation Temperature 5℃~40 ℃
Storage Temperature -20℃~ +55℃
Ambient Humidity ≤80% no condensation in operation | ≤93% no condensation in storage
Atmosphere pressure 86kPa~106kPa
Two AAA 1.5V, 800mAh alkaline batteries could be continuously
operated as long as 30 hours
It works as advertised. Response and readings are very fast and accurate. Reference comment by Larry C. there are numerous sources on SpO2 levels and hypoxia on the web that can found by doing a simple web search using the terms hypoxia SpO2 in the search engine.
Works as advertised. However, I bought it to monitor oxygen saturation while flying to avoid hypoxia, and theres nothing in the literature to tell you what levels constitute dangerous percentages. Id think paying that much, it should be included.