Hoosier, your point is taken, but if you do a search on "D9" you get a character limit error, and expanding the search criteria with "Suunto" or "Wireless" gives a lot of extraneous results. So, maybe this will help.
From the SUUNTO website, D9 product page:
"Suunto D9 can be used with up to three different gas mixes containing 21-100% oxygen, allowing gas switching during the dive."
From the D9 manual:
"WARNING!
DO NOT EXPOSE THE D9´S OPTIONAL PRESSURE TRANSMITTER TO ANY
GAS MIX CONTAINING MORE THAN 40% OXYGEN! Enriched air with greater
oxygen content presents a risk of fire or explosion and serious injury or death."
So, you can do the gas switches and the D9 will calculate your Decompression obligations, but you will not be able to wirelessly monitor any high-O2 or pure O2 decompression gasses. You can probably use the wireless transmitter for your bottom gas, though.