Some Window Controllers are specially made for parallel window control. The controllers are usually with larger loading of transformers to power several window actuators together. For example, the maximum current loading of KST-B14 and KST-B18 are 4 Amp and 8 Amp. Generally, the full loading of each KST-A01 linear Actuator is about 1 Amp. So KST-B14 can support 4 pcs of linear actuators.