▁well ▁under ▁US $ 1 0 . ▁$ 2 – $ 5 ▁for ▁ 4 0   m W ▁is ▁a ▁cost ▁of ▁$ 5 0 – $ 1 2 5 ▁per ▁w att . ▁ ▁There ▁are ▁three ▁sizes ▁in ▁development : ▁ ▁The ▁micro B elt , ▁a ▁ 1 2   cm ▁version . ▁ ▁This ▁could ▁be ▁put ▁into ▁production ▁in ▁around ▁six ▁months . ▁ ▁Its ▁expected ▁to ▁produce ▁ 1 ▁mill iw att ▁average . ▁To ▁charge ▁a ▁pair ▁of ▁ideal ▁re charge able ▁AA ▁cells ▁( 2 . 5 Ah ▁ 1 . 2 v ) ▁this ▁would ▁take ▁ 6 0 0 0 ▁hours , ▁or ▁ 2 5 0 ▁days . ▁ ▁The ▁Wind cell , ▁a ▁ 1 - met re ▁version ▁that ▁could ▁be ▁used ▁to ▁power ▁mes hed ▁Wi Fi ▁repe aters , ▁charge ▁cell ph ones , ▁or ▁run ▁LED ▁lights . ▁This ▁could ▁go ▁into ▁production ▁within ▁ 1 8 ▁to ▁ 2 4 ▁months . ▁It ▁is ▁hoped ▁that ▁a ▁square ▁met re ▁panel ▁at ▁ 6   m / s ▁average ▁wind speed ▁can ▁generate ▁ 1 0 ▁W ▁average . ▁ ▁An ▁experimental ▁ 1 0 - met re ▁model ▁that ▁has ▁no ▁production ▁date . ▁ ▁The ▁Wind b elt ' s ▁invent or , ▁Sh awn ▁F ray n , ▁was ▁a ▁winner ▁of ▁the ▁ 2 0 0 7 ▁Break through ▁Award ▁from ▁the ▁publish ers ▁of ▁the ▁magazine , ▁Popular ▁Mechan ics