Need something more powerful than your existing motor / ESC fan? This is exactly the fan for you. Yeah Racing Tornado Cooling Fan has Ultra High Speed. You need unmatched performance that this fan delivers. This dual ball bearing fan flows up to 100 Percent more air than other similar Fan. The maximum power input voltage is 8.4v (2 cells Li-Po) For the best performance, please run the Yeah Racing Tornado Cooling Fan for 2 - 3 hours continuously on the first time usage. Dual fans are wired so you only need one power port to run both fans at the same time! Feature: For: ESC / Heatsink / Motor Color: Black Material: Plastic Specification: Dimensions: 30 x 30 x 10mm Bearing: Dual Ball Bearing Operating: Voltage 5V Start-up Voltage: 3V Power: 1.40W Fan Speed: 14000 R.P.M (¡Ó20 Percent ) at 25J, after 3 min. rotating. Max Air Flow: 5.501CFM. Current: 0.28A Weight: 9.0g Connector: JST Include: Tornado Dual Fan (1 pc)