Rechargeable battery pack quickly charges two devices at once. Use it for tablets, phones, portable speakers and more with super-quick charging capability. 10,400 mAh lithium-ion battery charges phones up to six times with the 2.1A maximum output from two USB ports. Super-quick 2A input reduces recharging time. Samsung SDI lithium-ion battery offers 500 full charging cycles, losing only 2 percent charge per month for long-lasting performance. Rugged materials and durable components ensure years of use. Built-in circuitry protections provide safe, controlled operation. Compact design with black, soft-touch finish fits comfortably in the hand and slips effortlessly in a pocket or bag. The Tour 10400 Battery Pack includes a 2' long micro USB cord for convenient charging.