We use them at an organized hunt every year with no real issues. Don't expect to get clear signals in the jungle or over extremes in terrain, over the moutain to the next valley. In general we have no trouble, sometimes you have to mvoe a few feet, but that's about it. When you do your research, get the ones with the highest output wattage. Some are listed by distance, that's a gimmick, the ones I bought are 4 watt, I've seen models in the Cabela's magazine up to 5 watt now. Make sure you can replace the rechargeable batteries with "AA" types if the others die out. Mine also came with a 12VDC/120VAC charger.