Dual Frequency Speed Control Wireless Remote Controller RJA08S2-0 Industrial Frequency Converter Wireless Remote Controller Proportional Quantity Adjustment Wireless Remote Controller, designed specifically for dual frequency, capable of controlling the speed of two frequency converters and six switch actions, such as the forward and reverse operation of three frequency conversion motors. Product Features $ Remote controller's control distance up to 200 meters (open, straight-line distance) $ Full isolation design