We were traveling with 2 vehicles on a European tour and the devices have used to communicate between vehicles, without having to pay expensive roaming charges for mobile phone calls. Our experience: the range varied between about 1 km and 3-4 km on the highway. The more hills nonetheless. On freezing hallway the range was much higher until about 9 km. The batteries have gone through without difficulty with daily operation 1 week. Rain wear the devices also can not harm. Therefore 5 of 5 stars.
