If your remote control has broken, you could possibly buy this as a replacement.
From Amazon
NX8 8 Channel DSMX Transmitter Only
Model Bau
Spektrum NX8 8 Channel DSMX Transmitter Only P-SPMR8200EU
eModels
Spektrum NX8 8 Channel DSMX Transmitter Only # SPMR8200EU