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==usage==Just going to cover some of the most useful features. The center button on the bottom with the dot is the "setup" button to access the main configuration options.The letter buttons around the face of the unit A B C on the left and D E F on the right are a type of memory that stores the configuration including:* Freq, band, and modulation both sides.* details...Press and hold in the letter key to "save" the configuration. Dials are covered well in the manual.