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Apply to : for FM walkie-talkie debugging. F3: closed, open signal output. F3 key: Function key When the cursor is pointing to the output power, sub-tone or modulation tone, it is a cycle switch function, e.g., when the cursor is pointing to the power output, the function of this key is a cycle switch signal output.
When you click on links to various merchants on this site and make a purchase, this can result in this site earning a commission. Affiliate programs and affiliations include, but are not limited to, the eBay Partner Network.