Radio frequency

I use this set for 1.5 years for triggering the flash unit in the studio, sometimes outdoor for off-camera flash with clip-on. Short and concise review: I am very happy and never had dropouts or nuisance tripping.
But be careful!
The end of 2010 I bought this set + an additional receiver. At this time, the working device with a radio frequency of 433 MHz. Individual recipients of these are no longer available, so now I ordered another complete set. In the technical data is 433 MHz and that is wrong! The variant was actually delivered with 2.4 GHz! Both are of course not compatible and therefore I will probably still need to order additional 2.4 receiver!
So who is hoping his old, tried and tested system to be able to supplement by purchasing an additional receiver and in addition to get a replacement transmitter will be disappointed!