... SmartPhone & Ipad 5200mah monocrystal silicon portable solar charger Technical Parameter1.Solar panel:5.5 V,3W 2.Solar conversion efficiency above 17%3.Built ... battery.2,Temperature compensation ,heat-regulation and TSD functions.3,PWM control the constant voltage.4,Auto protection function:overcharge,over ... mm,NG:281G,GW:703G 5200mah monocrystal silicon portable smartphone solar charger