Standard Module 72MHz FM This is the Spectra Synthesized Transmitter Module for the RCD/Hitec Eclipse, Prism, or Optic Radios Features Synthesizer Allows You To Pick and Choose from All Fifty 72mHz Channels Replaces Your Current Single Channel RF Module, without tools or Modifications No Special Receivers Required, Simply Dial-In the Desired Frequency, Change the Receiver Crystal and Your Ready to Fly . Works in Both PPM and PCM Modes For more information and option to buy link to: www.sigmfg.com