Features: Input 5V2A, output 9V 8W, 5.5x2.1mm interface is positive inside and negative outside, suitable for 9V router, speaker, LED light, etc Safe & Reliable, our voltage adapter provides your devices perfect protecetion from over-current, over voltage, overload- or short circuit. Useful for powering the WiFi router via power bank- or other 5V power source during power outages. Can also be used with other devices that require 9V power supply. Widely Usage, Super convenient for different kinds of devices such as Fan, Table Lamp, Wireless Router, Speakers that requires for 9V power. Plug-and-play, you can still enjoy the wifi during power cuts. Specifications: Input: 5V2A Output: 9V 8W DC:5.5x2.1mm interface Cable Length:approx 1M/39.37in Suitable for 9V router, speaker, LED light Package Includes: 1Piece USB to DC Cable note: Please check the USB input 5V 2A or higher, make sure your devices need 0.8A or less before you purchase the item, or the adapter may not work for your project. Due to the problems of lighting effects and shooting angles, there will be certain tolerances in the product, please understand. Please allow 0-2mm error due to manual measurment.