There are two main differences between Finn and Finn mobile Finn is equipped with a fixed cable. Finn mobile has a rechargeable battery that you can charge using the detachable cable supplied. You can also use Finn mobile connected to the mains when using indoors. Finn mobile has IP44 certification which means you can use him indoors as well as in covered outdoor areas. Finn does not have this certification and can therefore only be used indoors. Visually, Finn and Finn mobile differ only slightly. There is a button on the base of Finn mobile so that you can easily check the battery charge level. If you press it, the LEDs above it will show you the current battery charge level. Finn does not have these LEDs.