Features: 1. Mini Fan Motherboard2. N9 Holding Fan PCBA3. Three Gears Adjustable Wind Speed4. Overcharge, Overvoltage, Reverse Connection Protection5. Professional Installation Is Required To Avoid Product Damage.Description: Type: Fan MotherboardsButtons: Press Once To Turn On The , Press The Second Time To Be At The Second Gear; Press The Third Time To Be At The Third Gear, Press The Fourth Time To Shut DownCharging Mode: 5V/500MA ChargingBrushed Low-Voltage 3.7V Motor SolutionNote: Different Batches, Product Appearance, Color, And Characters Will Be Different, Which Will Not Affect The Usesize: B-17.8 x 17.8mmMaterial:Copper + epoxy resin (EP) + organic resin + glass fiber cloth basecolour: As shownPackage Contents: 10 x Fan MotherboardsOnly the above package content, other products are not included.Note: Light reflection 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.