RE: Whats the difference between these two?
From Hitecrcd.com; The more expensive one has the SPECTRA synth module on the transmitter.
Item# 129271 - 27MHz Transmitter with
HFS-03MM 3 Channel Receiver, one HS-311 Servo, Switch harness and Dry AA Battery box, no Transmitter NiCd's
Item# 129751 - 75MHz Transmitter with
HFS-03MM 3 Channel Receiver, one HS-311 Servo, Switch harness and Dry AA Battery box, no Transmitter NiCd's'
Item# 129752 - 75MHz Transmitter with
HFS-03MM 3 Channel Receiver, one HS-645MG Hi-Torque Servo, Switch harness and Dry AA Battery box, no Transmitter NiCd's'
Item# 129753 - 75MHz Transmitter with
HFS-03MM 3 Channel Receiver, No Servos, Switch harness and Dry AA Battery box, no Transmitter NiCd's'
Item# 129754 - 75MHz Transmitter with SPECTRA Synth module, HFS-03MM 3 Channel Receiver, No Servos, Switch harness and Dry AA Battery box, no Transmitter NiCd's'
Item# 129756 - 75MHz Transmitter with SPECTRA Synth module, Switch harness and Dry AA Battery box, no Transmitter NiCd's, No Servos