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Know the choices. There are two types of two-way radios: family radio service (FRS) models, which have a maximum range of two miles, and the more powerful general mobile radio service (GMRS) models, with a maximum range of five miles. Expect to pay about $40 to $200 a pair. What to look for. Some features make a two-way radio easier or more convenient to use. Button lock prevents buttons such as talk, volume, or settings from being accidentally pressed when you're carrying the radio. Vibrate alert signals an incoming call without disturbing those around you. A transmitter cutoff stops transmissions when you've held the talk button for longer than 1 ...