This USB charging block is designed for Fire Tablets, Kids Tablets, Kindle e-Readers, Paperwhite, Oasis, Wireless Speakers & Headphones. This can be used for charging tablets with micro USB or USB C Type c ports. Compatible with Amazon 5W USB OEM Charger and Power Adapter for Fire Tablets and Kindle eReaders. Input: 100V-240V, 50-60Hz, 0.5A, Output: 5V=3A 15 Watts, 9V=2A 18 Watts, 12V=1.6A 19.2Watts Multi-voltage charging. Adaptive voltage output to deliver a faster charge. Charger takes advantage of higher power levels to quickly and effectively charge devices With multiple levels of voltage limiting, current limiting and temperature protection, this block charger is uniquely designed to ensure healthy battery life cycles regardless of connector.