The USB Portable Emergency Charger by Vibe Auto is a black plastic charger designed for universal use with cell phones. It is powered by 4 AA batteries, making it a convenient and portable emergency power source. Measuring 88mm in length, 68mm in width, and 18mm in height, this charger has a mini-USB connectivity option and is suitable for various devices. With a weight of 41g, it is a practical solution for on-the-go charging needs.