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Redcat's like the Volcano have rebrand Flysky FS-GT2 stuff so the tx's will bind with Flysky receivers which are usually less than 10 bucks the older ones use AFHDS rx's the newer ones use (GT2E rebrand) use AFHDS2A. The Arrma ATX100, Axial AX-3, Tower hobbies TH-124 also use Flysky protocol (AFHDS). These can be bound to different receivers and not have to rebind (not used at the same time) but don't store settings (steering trims etc.).