How to open the alarm function on RT22/RT622?
RT22 is Retevis hot sale radios for business and personal use. Many people like its small size, light weight, good quality with great price.Today we introduce you how to open the alarm function on RT22/RT622. RT22 has functions as follows: Scan, VOX, Alarm, Beep. Many people do not know how to use when they […]
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