I-Bollon 8000mAh Ultra Slim Aluminum Portable Charger Backup External Battery Power Bank for Samsung iPhone Smart cellphone and PC tablet (Black) MAGIC DESIGN - Ultra-slim brushed aluminum portable external battery  9.5mm thin POWERFUL BATTERY CHARGER - External battery provides a THREE times full charge for iPhone 6, 5, 4, and most smartphones, True 8000 mAh battery capacity with TopVolt technology GUARANTEE SAFTY - Supports over-charged, over-discharged, over-voltage, over-current and short circuit protection, perfectly protects your digital devices from charging accident. FAST CHARGE TECHNOLOGY: Use this external battery to charge smartphones and tablets faster and smarter than others WARRANTY GURANTEE - We give our customer 12 months warranty with friendly customer service. 30 days unconditional replacement or money back guarantee