From the professional trimmer section we find the Stihl FS 111 RX.While we already know the R in the model number stands for the rounded loop handle, the X at the end means it's a lightweight version.

Battery-powered Stihl string trimmer models have an A (for the German Akku which means battery in English) attached to the end of the FS model nomenclature. The FSE 60 model is the only plug-in ...