[Cooling Fan for Switch OLED] - The cooling fan is compatible with Nintendo Switch Dock Set (OLED model HEG-007). Just take off the back board, attach this external cooler to your new doll. The built-in turbo cooling fan blows cold air into the Switch console and prevents overheating [3 Working Speed Options] - Click the button to select a suitable speed: High / 3000 RPM, Medium / 2600 RPM and Low / 2000 RPM. The fan blades light up a vivid blue light. The alternating brightness indicates which gear is in. The heat dissipation back cover can be switched off in winter days [Designed for the New Dock] - Exclusively designed for the 2021 new doll. Stylish profile seamlessly fits Switch Dock and works smoothly. Powered by the external USB port of the Dock, no need extra power adapter. Two color options: black and white. (Please note: This edition only works with the OLED model, it is not compatible with the old doll modelled HAC-007.)