Belkin Power Pack 4000 USB Charger: * 4000 mAh power for charging on the go * Portable, slim and lightweight * Rechargeable * 2 ports for simultaneous charging * Built-in thermal management, and over-current and short circuit protections * StorageSafe technology holds 95 percent charge up to 30 days * Convenient charge indicator * Includes two 6" USB to micro-USB cables and wall adapter