Features: Experience Controller over your cooling comfort with USB Fan Speed Controller, featuring stepless speed adjustment to fine tune your fan breezes effortlessly. This and efficient controller with convenient knob and Switches, allowing for between strong and weak Airflows setting to personals preference. for office workers and enthusiasts customizable cooling solution, this USB fan regulator ensures a comfortable environment while tackling tasks or enjoyings time. Enhances your desk, bedroom, or travel with portable fan speed governor, for creating a soothing in USB fan. with construction and easy to use interfaces, the USB Fan Speed Controller is essential accessory for anyone to their fan performances for enjoyable living or workspaces. Specifications: Material: PCB Style:3Pcs Size:as picture show Package Includes: 3Pcs USB Fan Speed Controller note: Please allow 0-1cm error due to manual measurement. make sure do not mind before bid. Due to the differenceS between different monitors, the picture may not reflect the actual of the item. Thank you!