Portable compact power system. Great for backup power, camping, emergencies, and remote telemetry applications. Advanced Lithium Polymer battery is lightweight, powerful, and retains it's charge longer. This versatile power system can power/charge any USB device including cell phones, tablets, GPS devices, MP3/MP4 players, iPods, etc. Recharge the Power Pack from any USB power supply (USB power cube, laptop, etc.) with the included USB cable. Also can be charged with the USB Solar Chargers in Related Products at left. Short-circuit and over current protection. The Power Pack will automatic shutdown when there is a short circuit or output overload to protect the Power Pack from damage. Power Pack includes an on/off power button and LED battery capacity indicator. Product Uses: * Mobile phones and devices * Dual 5V USB power outlet - charge 2 devices at the same time!