Flysky FGR4S V2 AFHDS3 Mini Receiver. The FLYSKY FGr4S receiver uses the new AFHDS 3 protocol (third-generation Automatic Frequency Hopping Digital System). 1x Flysky FGR4S V2 AFHDS3 Mini Receiver. It makes a great addition to your FLYSKY Noble NB4 Surface Radio.
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