Simply turn two dials to access the desired frequency-no crystals to change. Installs easily in the top of transmitter in place of standard module. One year limited warranty. One 27MHz Futaba Synthesized Module for the 3PK/S radios with tuning screwdriver is included.

Will only function in the Futaba 3PK/S radios. This will not work in the 9C radios. Antenna must be extended to avoid damage to the module. There is no instruction manual for the synthesized module. Changing the channel, you have two pots, label 0-9, From left-to-right, you set the first pot to zero, the second pot you assign the channel number:
0 1 = A1
0 2 = A2
0 3 = A3
0 4 = A4
0 5 = A5
0 6 = A6
When you assign the module to a new channel, Turn the transmitter OFF while making the change, turn it back ON, wait for a few seconds. The servo should switch setting and you know you have a signal.

Installing-squeeze tabs and push straight into transmitter
Tuning to match receiver frequency
Removing-squeeze tabs and pull straight out