Really compact, the possible settings and group mode offer something more easy to use, scope remains theoretical, being in the city and around the buildings got maximum range of 600m, but it must be plain easy exceed several kilometers. Their autonomy (16h) is really good, but the charging time of 16h also force to reload without emptying completely if it is used often. However, one can use a different charger more powerful than that (tiny) supplied. For the price, I totally recommend! :)
