The Linklogic™ Remote Wall Control Can Be Installed In Any Single-Gang Electrical Box, And Features Push-Button Switches For The Lighting Control That Previously Occupied The Space. No Control Wiring Is Needed From The Linklogic™ Control To The Range Hood-All Communication Is Accomplished Over Existing Ac Power Wires. Adjusts Blower Speed By Pushing "Fan Up" Or "Fan Off" Buttons.