for Raspberry Pi 4B 3B 3B PWN Speed Adjustable1. For all models of Raspberry Pi, with switch control PWM mode and adjustable speed.2. The switch has three settings: ON-OFF switch and PWM mode. PWM can be controlled and can be turned on at any specified temperature.3. All copper material, the base has a built-in radiator to make the CPU cooling effect better.4. The cooling fan uses only 12 GPIO pins, allowing other GPIO pins to be used for other projects.Colour:BlackMaterial:ABS+copperPackage Contents:1 x radiatorOnly the above package content, other products are not included.Note: Light shooting 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.About UsWe provide the good product with the best price,we support Wholesale/Drop Shipping Order1. For Drop Shipping order, please remark"dropshipping order", we will prioritize it.2. For Wholesale/Drop Shipping orders, if you have any ideas about the price or package,please contact us in advance,we will give you the best service to satisfy your demands.About Shipments1.We will send out the orders ASAP once your payment is completed normally.2.Please write your complete delivery address with correct phone number and zip code, especially please confirm your full name.About After-sale ServiceWe are reliable seller and we have our professional after-sale service for all of our customs. If there is any question about the order,please contact us in advance ,we will always here until you get a happy answer.About Feedback1. Please check the package and item when you get carefully to make sure there is no problem.2. If you have any problem or are not entirely satisfied with your package,please don’t be hesitate to contact us first before leaving negative feedback. We will resolve the problem to satisfy you.3. If there is no problem, please leave us five star positive feedback.Your affirmation is our greatest motivation ! !