The FRS radios are actually based on seven 462 MHz UHF channels and seven 467 MHz UHF FRS additional channels. The FRS radios are limited to -watt transmitters and range should be around two miles. In real use, expect one mile or less in populated areas. The FRS radios are extremely common now with groups of vacationers at theme parks and day hikers and because of this, even with fourteen channels, you are going to have lots of traffic. Having used a pair at a theme park, the constant chatter was so annoying I turned them off.
Frequencies chart below.
This is why the transmission distance is over four to five miles and why the FCC requires a license to operate them. The disadvantage of the more powerful transmitter is battery consumption and the weight of the units due to the larger batteries. A 2-watt transmitter will require 40 to 50 times as much power as the 49 MHz and 900 MHz transmitters. Lower powered 462 MHz radios do not require a license to operate. The range on the lower power radios is almost identical to the 1-watt 900 MHz radios.