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Specifications: Input: 7-12cells NiMh/NiCd or 3-4 cells LiPo. Size: 24.5mm(L) * 24.5mm(W) * 10mm(H). Weight: 7.2g How to Use : You need to choose different cooling fan in different applications. For 4-6 Cell NiMhNiCd/: You needn't change the normal voltage cooling fan coming with the ESC; For 7-9 Cell NiMh/NiCd: You must change the fan because it cannot work with such a high voltage, so please choose a high voltage fan or supply the fan from the receiver (+6V); For 10-12 Cell NiMh/NiCd: You must choose a high voltage fan, and cut the output of the built-in BEC, then supply the receiver with an UBEC (An additional external DC-DC regulator); The difference of "normal voltage cooling fan" between "high voltage cooling fan": Type Input (Lithium Battery) Input (NiMh or NiCd) Normal voltage cooling fan : 2 cells LiPo , 4-5 cells NiMh/NiCd High voltage cooling fan : 3-4 cells LiPo , 7-12 cells NiMh/NiCd This is included: 1pc x Hobbywing High Voltage Cooling Fan for Car ESC