Features: 130cm cable for daily use with on/off switch and brightness or speed control. 3.4V-5V output adjustable. 2-in-1 design: USB to 5.5x2.1mm male switch cable for desk lamp and other devices, and USB male to female extension power cable for USB devices. Powered by laptop, PC, power banks, USB charger, or wall charger with USB port. USB male to female connection; for power supply only, does not transfer data. Suitable for USB desk fan, hanging fan, single color LED light, and other 5V powered devices. Adjust to increase voltage toward the USB interface, decrease voltage toward the 5.5x2.1mm interface. High-quality 5V USB brightness or speed control power switch cable for 5V desk, ceiling fan, single color LED lamp, and more. Specifications: Input voltage: DC 5V 2A. Material: Plastic. USB power cable length: 130cm. Quantity: 1 piece. Note: Please allow 1mm error due to manual measurement. Due to differences between monitors, the picture may not reflect the actual item color. Package includes: 1 x USB to 5.5x2.1mm switch cable. 1 x 5.5x2.1mm female to USB female converter.