Both buttons have a short and a long press function. The button right below the PTT button is typically programmed to short press Monitor, long press Sticky Monitor. The bottom button comes from the factory on scan/nuisance channel delete. The buttons can be custom programmed when the dealer is programming the radio, so these are just a general guess based on the factory default setting. Other options include repeater talkaround, high/low power, volume set, and maybe tight loose squelch.
Best regards.
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