Features: 12V brightness or speed control power switch cable for 12V router, speaker, desk ceiling fan, single color LED lamp, and more. 130cm cable for daily use, with on/off switch and brightness or speed control. 6V-12V output adjustable. For use with 9V or lower voltage devices, a voltmeter is recommended to test output voltage. No voltage testing required when used with 12V devices. Input: USB 5V 2A-3A; 5.5x2.1mm output: 6V-12V 0.5A. Adjust voltage higher toward the USB interface, lower toward the 5.5x2.1mm interface. Powered by laptop, PC, power banks, USB charger, or wall charger with USB port. Power supply only, does not transfer data. Wide application: Designed to adjust brightness of single color LED lights such as 12V 3528, 5050, 5630 strip lights, ideal for indoor lighting, holiday decoration, 12V fan, car lights, car fan, and more. Specifications: USB input voltage: DC 5V 2A-3A 5.5x2.1mm output: 6V-12V 0.5A Material: Plastic Cable length: 130cm / 51.1 inches Quantity: 1 piece Note: 1. Please allow 1-2cm measurement deviation due to manual measurement. Ensure you are comfortable with this before ordering. 2. Due to differences in monitor displays, the actual item color may vary slightly from the image. Thank you for your understanding. Package includes: 1 x USB to 6V-12V 5.5x2.1mm switch cable