IC-F21 is a walkie-talkie product with features such as channel selection, volume control, and squelch. It can be used for communication and receiving information. Prior to use, it requires charging preparation, and the status of the indicator light indicates the charging status and battery level. Basic operations include turning on the power switch, selecting channels, and pressing the transmit key for communication. When not in use for a long time, the battery should be fully charged and removed.