The digitalSTROM basic package dS-BP200 represents the entire basis in your fuse box. Once installed, you can network any devices, lights and much more with digitalSTROM. It is designed for 3 circuits. For each additional circuit required, another dSM20 (digitalSTROM meter) is required. The set consists of 3x dSF20, 3x dSM20, 1x dSS20.