From the 1960's Irwin Allen Hit Series " Land of the Giants,"
we've produced a Plug-N-Play turbine Engine sound system..
   Provides engine turbine startup, to continuous running, flip
the switch, and the turbine will begin to power down.

This kit is for the larger Spindrift models, not the pocket spindrift.

  Just add 3x AAA batteries, turn on the power switch at the battery,
flip the engine switch to commense startup. During inflight,
when you're ready to land and shutdown, flip the switch in the other direction.

Kit Includes:
1x Fully assembled Plug-N-Play Spindrift turbine engine control
  board with sound board with speaker, on/off power switch,
  and engine on/off switch.

  For those that want the engines louder, the soundboard has 1/8" (3.5mm)
output jack that you may add self powered amplified speakers that have volume control.
Such is an example on amazon where many styles of speakers are available.
Amazon Speakers.

Required
No soldering required
3x AAA battery