ger ▁for ▁mobile ▁devices . ▁It ▁was ▁developed ▁by ▁Ser bian ▁company ▁St raw berry ▁Energy . ▁It ▁won ▁first ▁place ▁in ▁the ▁European ▁Commission ’ s ▁" S ust ain able ▁energy ▁week ▁ 2 0 1 1 " ▁competition ▁in ▁Br uss els , ▁in ▁the ▁category ▁Cons uming . ▁ ▁Function al ities ▁▁ ▁St raw berry ▁Tree ▁is ▁a ▁solar ▁and ▁Wi Fi ▁station ▁which ▁is ▁perman ently ▁installed ▁in ▁public ▁places ▁such ▁as ▁streets , ▁par ks ▁and ▁squares , ▁providing ▁pass ers by ▁with ▁the ▁opportunity ▁to ▁charge ▁their ▁mobile ▁devices ▁for ▁free ▁when ▁they ▁are ▁outside . ▁Its ▁main ▁parts ▁are : ▁▁ ▁Sol ar ▁pan els ▁that ▁transform ▁solar ▁energy ▁to ▁elect rical ▁energy ▁ ▁Re charge able ▁batter ies ▁which ▁accum ulate ▁energy ▁and ▁make ▁St raw berry ▁Tree ▁function ▁for ▁more ▁than ▁ 1 4 ▁days ▁without ▁sun sh ine ▁ ▁Six teen ▁c ords ▁for ▁different ▁types ▁of ▁mobile ▁devices ▁such ▁as ▁mobile ▁ph ones , ▁cam eras , ▁mp 3 ▁players ▁etc . ▁ ▁Sm art ▁electron ics ▁which ▁enables ▁balance ▁between ▁produced ▁and ▁consum ed ▁energy ▁ ▁Also , ▁St raw berry ▁Tree ▁provides ▁free ▁wireless ▁internet ▁in ▁the ▁immediate ▁surr ound ings . ▁ ▁History ▁ ▁The ▁first ▁idea ▁of ▁a ▁public ▁solar ▁char ger ▁for ▁mobile ▁devices , ▁St raw berry ▁tree ▁was ▁developed ▁by ▁Mil o š ▁Mil is av l je vić , ▁founder ▁of ▁St raw berry ▁Energy ▁company . ▁ ▁, ▁there ▁were ▁eleven