There are many factors that can cause certain walkie talkies to go farther than others, and in some cases a 5 milliwatt radio can go the same distance as a 5 watt radio. There are actually two types of walkie talkies; there is the FRS (family radio service) which is 5 milliwatt, and the GMRS (general mobile radio service) that can go anywhere from 5 watts to 100 watts (although all handhelds are 5 watts). So your best bet would be to find a FRS/GMRS capable radio that many companies like Midland, Cobra, Motorola etc make. And yes, wattage does play a huge role in distance, but there is also another factor to consider.
I've noticed that many people get so worked up over how many watts their radio has, but they are missing a crucial point. The antenna size is probably THE most important factor in transmission distance. To put it in perspective, a 5 watt GMRS radio with a 5 in antenna can go about 4-5 miles in very MILD terrain (trees, hills etc), while a 4 watt CB radio with a 5 ft antenna can go for about 40 miles in the same terrain. Now it is obvious that you can't find a GMRS radio antenna with anything over a foot, but some are slightly larger than others. To narrow it down, the best radios would be split between Uniden, Cobra, Midland, and Motorola's "top of the line" (aka the most expensive) radios. My personal experience would favor either Cobra's CXR925 or Midland's GXT1050VP4. Motorola also makes excellent radios, but I'm just not a big fan of their line only for petty reasons. On a side note, NEVER buy the radios from the manufacturer. Always buy them from places like eBay since you can easily get $20 off on the exact same radio, brand new.
Before selecting a walkie talkie just check the communication range and its battery life. TalkPRO is a good walkie talkie having strong battery life and good communication range.To know more about TalkPRO walkie talkies check http://www.iconetwireless.com
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