NEWEST Turning Technologies RRRF-04 Receiver for RF & NXT Systems Newest RF Receiver (2014). MSRP of $699 through Turning Technologies. Brand new. No driver installation allows for easy implementation. All software available for free download through Turning Technologies. The radio frequency technology allows for a 250 foot range and does not need a "line of sight" with the ResponseCard keypads. Only receiver, along with the RRRF-03, compatible with the newest NXT software Connect up to 1000 ResponseCards