When you power cycle the device up (unplug for 10 seconds, plug back in, a 6-digit number will appear on startup. The last 3 large numbers identify the device software version. Current factory release Ultra, Excel, Plus (276/272) - Latest Available Update v.276 Current Factory release Magna (476/472) - Latest Available Update v.476 **Note, All connected devices if eligible for an update will automatically receive an OTA (over the air) update. Your device screen may flicker off and on or Flash display readings for a short period indicating download / installation. Do Not Unplug device**