Model: YG-ZX12N (Built-in battery) Model: YG-ZX12W(External battery) Common spec. Constructed by amorphous silicon solar modules, mounting bracket,solar controller,battery and loading unit(DC lamp or other digital equipment). It's can provide electricity for lighting,charging mobile,MP3,camera,etc. It's idea for rural remote area use where no electricity or unreliable electricity supply. System configuration: 1. Solar module 1 pc Power output: 12Wp, Output voltage: 17V, maximum output current:600mA Dimension: 855mm(Length) x 390mm(Width) x 22mm(Thickness) 2. Solar panel mounting bracket: 1 pc. 3.Solar Controller: 1pc Including battery protection, charge and dis-charge the battery, dual-voltage output ports. 4.DC energy saving lamp 7W/12V: 1pc 5.12V10AH free maintenance lead acid battery: 1pc (optional) System usage The solar module should be placed outdoor where no sun light blocked, it can provide 5-6 hous working period for 1piece of 7W 12VDC dnergy saving lamp, It's can also provide electricity for charging mobile,Mp3,camera and other digital devices.