"SideBand" (SSB) is a mode capability found in higher-end CB Radios. You will have access to the Upper & Lower Sideband Modes (USB, LSB), In addition to the "Regular" (AM) mode, on each of the 40 channels, using the "Am/USB/LSB switch. When switched to sideband, each receive signal must be "fine tuned" in with the clarifier or voice lock control found on the SSB CB radio, otherwise people will sound garbled or distorted. Keep in mind that when switched to a sideband, you can only communicate with other CBers that have that capability as well. You can usually expect an increase in range, & less noise on SSB, than on the "standard" AM 40 channels.