Features: 1. Mini Fan Motherboard 2. N9 Holding Fan PCBA 3. Three Gears Adjustable Wind Speed 4. Overcharge, Overvoltage, Reverse Connection Protection 5. Professional Installation Is Required To Avoid Product Damage. Description: Type: Fan Motherboards Buttons: Once To Turn On The , The Second Time To Be At The Second Gear; The Third Time To Be At The Third Gear, The Fourth Time To Shut Down Charging Mode: 5V/500MA Charging Brushed Low-Voltage 3.7V Motor Solution Note: Different Batches, Product Appearance, Color, And Printed Characters Be Different, Which Not Affect The Use size: B-17.8 x 17.8mm Material:Copper + epoxy resin (EP) + organic resin + glass fiber cloth base colour: As shown Package Contents: 10 x Fan Motherboards Only 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.