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#Input channel number by using the numeric keypad to select memory channel in MR mode. Note: This transceiver has a dual-watch function, you can switch between A and B channels using the “C” key (A/B switch key) on the microphone keypad. The A channel can only operate in MR/CH mode, while the B channel can be set to either MR/CH or VFO mode. Please refer to page 40-41 regarding the user-defined key function of the A/B switch and the VFO/MR switch.In VFO mode, the transceiver will store the most recently used frequency in each of its supported ranges. To switch quickly between the transceiver’s supported frequency ranges, press the key.