RetiCAM Stream Power Bank 8600mAh - Ultra Slim Aluminum Dual USB Backup External Battery Pack Portable Charger Ultra slim, only 0.47in thick with an aluminum casing for exceptional strength and durability; Dual USB outputs (5V/1A and 5V/2A) capable of charging two devices simultaneously. Max output 2.1A; High capacity (8600mAh) with enough power to charge a Smartphone up to 4 times or add 30+ hours of talk time; Premium Li-Polymer battery with more than 500 charge cycles during the course of its life; Four LED power indicators to show remaining capacity; Built-in over current and short-circuit protection.