The unit is very well made and easy to use. the included charging station is very convenient, however, in only the supplied Battery packs can be charged The included accus keep in normal use about 2 days 3x AAA accus eg Varta 800 mAh hold against ca. 4 days. the range is specified with about 8 km which is not achieved to some extent. Normally, approximately 2.5 Km 2 can be reached, therefore only four stars. we use the devices if our daughter playing to hang around in the settlement, or if we make a trip. Some neighborhood children have the same or similar equipment which prevails in our lively radio communications. (Is always cheaper than mobile, and according to my daughter so cool!) for the units are best suited. by and large a good investment