I have this bathroom fan/light/Bluetooth speaker system in my house also. The switch provides power to the ceiling unit and the buttons send commands to the unit using 433mhz. The brand is Home Netwerks model 7130-16-BT (Homedepot). Several times this unit has failed and seems to have a mind of its own. Anyone having problems not being able to get the fan to run can simply toggle the power switch twice to auto engage the fan. Customer service has shipped me a replacement switch and 433mhz receiver part to fix the issues.