Most Powerful Waterproof on the Market! CharlieGEAR "Gladiator" POWER BANK +18,000 mAh + AMAZING POWER, Water Proof Shock Proof Dust Proof (DC 5V 2.4 Output) Dual USB Port MILITARY GRADE -Crush Proof External Battery Power Bank - Must have when camping or outside concerts. One thing is for sure, this aint your grandmas power charger! Be careful not to sell for knock of products that dont say CharlieGEAR so maintain quality! ADDITIONAL FEATURES - Built in LED flashlight with Emergency SOS blinking function PERFECT POWER BANK - Output 1.5 or 2.4 for intelligent Device Charging. HUGE POWER- Charge Iphone up to 10X with Super Power Cell, plug two devices at once INTELLIGENT CHARGING - Automatic Intelligent Charging Shut Down When Charging Is Complete.