The Panasonic FV-VS15VK1 multi-speed module is created for the WhisperGreen Select line of fans. Panasonic WhisperGreen Select fans can be customized by adding one of the brand's patented modules. Once installed, a fan with this module cam easily change between fan speeds and have time delay functionality. This Panasonic module allows the fan to run constantly at a low level and then intensify to maximum operation when activated. A built-in timer then reduces the fan to the lower level after a period of time has passed. Other modules for WhisperGreen Select fans include a condensation sensor, SmartAction motion sensor and a NiteGlow LED night light. When paired with the condensation sensor, the WhisperGreen Select can also vary fan speed depending on moisture levels. If this module is used with the motion sensor, then it can automatically activate from movement as well.