iEXPLICIT DEFINITIONSRWARNING! NEVER connect the transceiver to anAC outlet. This may pose a fire hazard or result in an electricshock.NEVER connect the transceiver to a power source of morethan 16 V DC such as a 24 V battery. This connection will ruinthe transceiver.NEVER cut the DC power cable between the DC plug andfuse holder. If an incorrect connection is made after cutting,the transceiver might be damaged.NEVER place the transceiver where normal operation ofthe vehicle may be hindered or where it could cause bodilyinjury.NEVER allow children to touch the transceiver.NEVER expose the transceiver to rain, snow or any liquids.USE the specified microphone only. Other microphoneshave different pin assignments and may damage the trans-ceiver.DO NOT use or place the transceiver in areas with tem-peratures below –30°C (–22°F) or above +60°C (+140°F), orin areas subject to direct sunlight, such as the dashboard.PRECAUTIONWORD DEFINITIONRWARNING Personal injury, fire hazard or electric shockmay occur.CAUTION Equipment damage may occur.NOTE If disregarded, inconvenience only. No riskof personal injury, fire or electric shock.READ ALL INSTRUCTIONS carefully and com-pletely before using the transceiver.SAVE THIS INSTRUCTION MANUAL — Thisinstruction manual contains important operating instructionsfor the IC-F1721/D, F1821/D, F2721/D and F2821/D VHF/UHF MOBILE TRANSCEIVERS.IMPORTANTIcom, Icom Inc. and the logo are registered trademarks of IcomIncorporated (Japan) in the United states, the United Kingdom, Germany,France, Spain, Russia and/or other countries.All other products or brands are registered trademarks or trademarks of theirrespective holders.