Turning Technologies RF Receiver RRRF-02 for Responsecards Driver is preloaded on the operating system. Simply plug the receiver into the USB port and the device will immediately be recognized. Range: 200 ft (400 ft coverage). Range can be increased by utilizing multiple receivers or our long range receiver. Choose from up to 82 radio frequency channels for simultaneous polling. Capacity: Recommended for up to 1000 ResponseCards per (1) RF Receiver. Can be increased with multiple RF Receivers. Display: Easy to read LEDs for status and response traffic. Power and power management: Powered by USB port.