Solar Assist Charger, Mengo S-Power Shockproof/Water-Resistant 5300Mah [ Solar Assist Back-up Battery ] Charger Power Bank Featuring Dual USB Port Smart Charge Technology (For iPhone, iPod, iPad, Samsung, LG, HTC) (Camo) S-Power back-up battery pack includes LED emergency light, carabiner for easy carrying, IPX-4 Water-Resistance, Shockproof resistance, dual USB ports (Smart-Charge Technology) for simultaneous charging, LED charging indication, and micro USB charging cable IPX4 Water-Resistant Technology allows for slight water susceptibility, such as splashing and rain, and ultra shock absorbency disperses the impact to prevent damage Dual USB ports featuring Smart-Charge Technology for simultaneous charging Re-charge the back-up battery quickly using the included USB cable, or expose to direct sunlight in case of no power access The solar portion of this battery is to be used as a back-up only, not as a primary charging source. Due to its extensive charge period, a full day charge will only provide the battery with 1/8 of its total capacity