... USB car charger input DC 12v/24v 1.long life,MTBF:100,000hrs 2.conve 3.competitive price 4.output:DC 5.4v 300ma portable USB car charger ... input DC 12v/24v Specificationsemergency car charger usbenvironmental friendly, energy saving,Intelligent protection of output and input,emergency car charger usbenvironmental friendly, energy ...