Be the center of attention with this stylish aluminum slim power bank! It comes packed with a high-power efficient polymer battery, available in 4000 mAh and 5000 mAh capacity. Automatically detect and deliver the optimal charging current for any connected device-ensuring the fastest and most efficient charging. Price Includes: Free setups Free virtual proof Free 1 color silkscreen imprint on 1 location Free standard shipping to 1 continental US commercial location Free micro USB charging cable for charging the power bank Free standard box Free Power Bank's User Guide Input / Output: 5V-1000 mA Security Build-in: Short Circuit protection and Explosion protection Security Build-in: Overcurrent, Over charging/discharging protections Certifications: CE, FCC, RoHs