Application for Notebook & Desktop. ¿hermaltake?convenient solution with extremely ¿obile?concept inside. Perfect accessory for NB & PC. Directly plug into USB port. Unnecessary additional power supply. VR knob : Adjust fan speed manually. One-touch retractable USB power cable box. Slim USB power cable, only 0.6 mm in depth. With ¿t?badge fan grille to avoid touching accidentally.