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From Fellrnr.com, Running tips
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→Optional Oxygen Sensor
* Next the O2 sensor is attached to a blue "T" adapter. This is connected by a wire to the display unit. These sensors have an expected life of about two years, so it's handy for them to be easily replaceable.
* Finally there is the viral filter, the optional expandable swivel tube and the mouthpiece.
The cost of the Oxygen Sensor more than doubles the cost of the overall system, but this was worthwhile to me as I use the system on a regular basis. I would not recommend getting an Oxygen Sensor until you know how you get on with basic setup, but I've found it much easier to control my [[SpO2|SpO<sub>2</sub>]] than using the [[Pulse Oximeter]] alone.
==See Also==
* [[Altitude Training 101]]
