The Snapshot device continuously streams your vehicle’s data to Progressive’s servers while driving. For my device, it has a quad-band GSM module ( datasheet ), which makes sense considering Progressive inked a deal with AT&T to provide data service for it.
A researcher discovered last week that he could exploit Progressive’s Snapshot driver tracking tool in order to hack into the onboard networks of certain automobiles. Snapshot is a tool manufactured by Progressive auto insurance that plugs into the OBD-II port .
Put it in a vehicle that you rarely drive. Don't try to game the system, that defeats the purpose. If you get a high rate, there is a reason. Just take your time, concentrate on the savings that you will receive if you drive safely.
If the snapshot is left powered (by your car or otherwise) but is not moved for a significant period of time (perhaps a few days), then the lights will go out. This doesn't mean it has lost power.