WhisperGreen Select™ SmartAction® motion sensor plug 'N play module automatically activates when someone enters the room. Once the settings have been applied, the fan becomes truly automatic. This module also activates a 20 min delay Off timer for the fan. Panasonic SmartAction® Motion Sensor Module, Plug and Play, For Use With: WhisperGreen Select™ Series Ventilation Fan, Steel, Hot Dipped Galvanized, Domestic/Import: Import