Adjust the speed of your USB fan with this convenient speed regulator, providing a comfortable and quiet environment for electronic devices. Improve cooling efficiency with this user friendly USB fan speed regulator, suitable for various USB fan and easy installation. Suitable for office worker,home users, this USB fan speed regulator offer a practical solution for customizing fan speed according to individual preferences. The wind speed of fan can be adjusted between5V to 9V according to your comfort; USB speed controller 5W for USB ceiling fan, USB desktop fan, laptops fan, phone heat sink. Input: 5V 2A Output: 5V-9V 1A Maximum power: 5W Rated power: 3W Colour:Black Material:plastic Package Contents: 2 x USB speed regulator Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.