The Flash five is by far the best of the two Transmitters I beleve it has five model memories and some basic computer functions The question of course is does it work and is it safe to use, I have no idea The battery pack could be questionable, is that safe to use I have no idea. A new pack is probably going to cost 40 to fifty dollars.

For a receiver you will need a negative modulation shift FM Rx. Can be either single or dual conversion but must have the appropriate dual or single conversion crystal that is the same channel number as your Tx. You can change receiver crystals but not Tx crystals.
Some Futaba Rx's that meet the above criteria will work with the Flash Five. Examples of Hitec Rxs which may or may not work depending upon whether or not they also meet the above Criteria: (Many were also produced as positive modulation shift and will not work with the Flash five as it is not shift selectable) Are the 535, 555, various Supremes, SuperSlim and Electron Six.

The servos will probably work you can count on at least one having been subtancial crash (note the broken lug) .

You also will need a suitable wall charger, a flight battery pack, a six inch extension and a switch harness isn't it amazing how we are now rivaling the cost of a brand new quality system?

You also need to be aware that buying a used Rx even more than Tx's is a complete crap shoot, best of luck.

John