Features: This kit is designed to mount a high airflow quiet fan in the place of the original stock Dreamcast fan. It is specifically built for the Noctua NF-A4x10 5V fan. This mod shines in systems with GDROM emulators like the USB-GDROM and the GDEMU. It makes those systems nearly silent. It may not do much to systems with the original disk drive still installed as the disk drive is louder than the cooling fan. The Dreamcast Noctua Fan Cable, which custom built conversion cable that plugs into the original fan connector and converts the signal so that the new fan functions properly (built in 10K resistor). Package Includes: 1 Set Cooling Fan Kit A/ 1 Set Cooling Fan Kit B Specifications: Color:Black Material:Plastic Size:18x15.5x3.5cm/7.09x6.1x1.38in note: Please allow a little error on the size due to manual measurement. The color might exist slightly difference due to different displays.