Controller connection steps:(theLast picture) 1. Connect the positive and negative poles of the battery , the controller will detect the battery voltage automatically ; 2. Connect the solar panel to the controller; 3. Connect the load as show , don't connect it reversely; Note: Please connect in strict accordance with the picture show, otherwise it may cause the controller short circuit; the disassembly sequence is opposite to the connection sequence. Features: * Used to charge MP3 phones, pads or other controlled devices. * Dual female USB ports, you can easily charge the device through the * USB charging cable. * You can put the panel in the sun and use it to directly charge the device. * Suitable for outdoor biking, mountaineering, hiking, camping, traveling, etc. Specification: Material: Monocrystalline Silicone Battery Power: 100W Working current: 5A Voltage: 18V Waterproof rate: IP65 Rate conversion rate: 17.8% Number of USB ports: double Size: 36 * 33cm / 14.2 * 13inch Color: as show Packing Included: 1 X Solar Panel 4 X Suction Cup 2 X Buckle 1 X Alligator Clip 1 X Car Charger 1 X DC Male Cable Can not measure nearthe window, need sunlight Direct shot. Note: 1. Please allow 1-3cm (0.4-1.18") difference due to manual measurement and slight color variation for different display setting. 2. Due to the light and screen difference, the item's color may be slightly different from the pictures. Please understand.