cheaper, portable,2 LED use,lighting up 15 hours, cellphone charging, small solar power system Solar Energy Kit Operating ... controled charging and discharging for NI-MH battey,power supplying for LED bulb and cellphone charging.Operating ... charging.Notice:When green LED indicator turns off, power supply will be cutted down.Please connect solar ... yearsOver 2 years 3W 2 LED solar power portable system