This is the new version dual fan for 4 B+ module, 7mm 9-page cooling fan, heat-dissipating sticker on the back, simple and practical. More importantly, the noise is only 22DBA, other fan is over 30 , you 't have to worry about the noise any more. So 't hesitate to our mini super quiet cooling dual fan for your 4 B/3 B+. It won't make you disappointed. Size: 51mm x 25mm x 13mm Voltage: 5V Current: 0.3A : 1.5W Speed: 7500rpm Noise: 22DBA Weight: 31G Situable for 4 B / 3B+ Colour: black Material: plastic Package Contents: 1 * Dual Cooling Fan kit Only the above package content, other products are not included. Note: Light and different displays may the color of the item in the a little different from the real thing. The measurement allowed error is +/- 1-3cm.