A variable speed controller designed to replace and upgrade existing wired speed controllers to remotely adjust your AC Infinity fan. Each fan controller and receiver kit sets your fan speed using PWM technology (pulse width modulation) to optimally produce airflow and manage noise. It features 10-speed programming displayed with backlit white LED lighting in a circular array that progressively steps clockwise. Fan speed levels are retained using the onboard memory chip whenever power is shut off, resuming previous programming when your fan is reactivated. Please note only one receiver or wired controller may be used with each fan at a time, and cannot be used together.