Digital Speed Modulator with Automatic Variable Fan Speed Control with digital readout, micro-processor, corrosion and moisture-proof enclosure, noise filter, adjustable variable speed differential (1 to 21 degrees Fahrenheit) and 10 amp output. Handles two 20" or 24" Versa-Kool fans. Not for use with 36" fans. 115/230 Volt, 10 AMP. Two year limited warranty.
