inputs.text: good radio - ordered radios use inside detention center transmit basement top floor reinforced concrete cement block without loss clarity emergency button programmable must order programming disk cable emergency button transmits primary channel also programmable handsfree mode minimum 10 seconds automatically goes receive mode pressing pushtotalk button ends emergency modeensure order real programming disk recommend using vendor amazon according various message boards pirated copies sold elsewhere copies not workin detention center environment radios take beating get dropped sat upon generally beat nature job radios taken everything staff throw makes radios even better price lithiumion battery purchase entirely new radiothe radios repeatercapable havent yet used optionif agency tight budget need something transmit onsite radios excellent option