Ever since covid and working remotely I drive about 20% of what I used to. I'm guessing this device wont recognize that and reduce my bill to 20% the original amount.
My insurer's app sometimes complains I drive too few to determine my driving style, hence, cannot grant a discount. However the system averages the whole year, taking months into account where this actually did work.
For 200km / Month it's working just fine. Below that sometimes fails.