1x Flex & Plug (The fan is then plugged into the timer). (Includes installed lead & plug connected to high velocity, that can have to be taken off if paying for additional speed controller accent and tricky wired instead) Have to have Components? – Scroll to the bottom on the http://lorenzogvkzr.thezenweb.com/5-Simple-Statements-About-Underfloor-Ventilation-Fans-Explained-23381277