Solar Power Phone Charger Build-in Lithium Polymer battery cells, with short-circuit and over current and over charge and over discharge protection, device will automatically shutdown when short circuit or overload output happened, avoiding the destroy of device and accident. Waterproof, built in LED flashlight and with high capacity. Expect for tents and backpacks, this solar power bank is definately another necessities when you go camping.Dual USB output of 5V1A and Input 5V1A, US STOCK color for black,green,yellow.Add your school, sports team, organizational or company logo or message to create a branded promotion that’s sure to connect with your tech-savvy customers and supporters.