Motorola sells a large variety of these radios, FRS (family radio service) have 1/2 watt of power, GMRS (general mobile radio service) have between 2-5 watts. You can get a hybrid that offers both FRS and GRMS, (more channels),get a set that offers plenty of privacy codes, you'll be surprised how many people are using these things. Not so important when on the water, but on a crowded sports field you'll be glad you can switch to an unused channel. As previously mentioned they are line of sight reception, some say they are good for up to 50km, but realistically expect 1-3 km. I use them with my buds on the chuck, If you can see their boat you can expect reception.