Features10 different ringing melodiesBuilt-in torch function and headphone socketVOX function for hands-free use8 narrow band channels adjustableRange: up to 6kmDesigned with youngsters in mind, the National Geographic FM 2-Way Walkie Talkie is great fun to use and practical too. With a range of up to 6 Km, these devices can be used in all sorts of situations - trekking, orienteering, at a theme park, or just for hide and seek! They are particularly useful with slightly older children with whom you might just want to keep in touch with, as long as they are relatively close by.Just like professional walkie talkies, these have a range of communication channels so if other users are in the area, you simply change channels and keep the airwaves clear for your own use.The units have a range of ten different call melodies and there's an earphone socket for connecting headphones or earbuds (not supplied). Also included is an LED light that turns the units into handy torches.The Nat Geo walkie talkies have a two-year warranty which can be extended to FIVE YEARS by registering the purchase on-line.