If your remote control has broken, you could possibly buy this as a replacement.
From OnBuy
Carson 500501004 FS Reflex Stick Multi PRO LCD 2.4GHz - 14 Channel Remote Control with Receiver for Model Vehicles such as RC...
Conrad Electronic
Carson Modellsport Reflex Stick Multi Pro LCD Handheld RC 2,4 GHz No. of channels: 14 Incl. receiver