In the outdoors, walkie-talkies are in some cases more useful than mobile phones, as they do not require external base station support and can communicate freely with teammates in most harsh environments. In times of disaster, a GPS-enabled walkie-talkie can be used to send SOS signal.

The theoretical frequency band of Frs walkie-talkies is in the range of 144-146 and 430-440MHz. In fact, the center frequency of the antenna is at [145 and 435MHz], and the effect is better when it is close to the center frequency. Dual band radios allow for communications on the UHF (ultra high frequency) and VHF (very high frequency) bands in the electromagnetic spectrum.

VHF band is a frequency range of 144-174MHz. It is characterized by long propagation distance and weak ability to penetrate buildings. It is suitable for mountains, plains, and open fields.

The best frequency for wilderness hiking is 145MHz in the VHF band.