This is a replacement Hobbywing Xerun 2510SH-5V/0.16A Cooling Fan. This fan is intended for use with the Xerun 120A V2.1 and Xerun 90A V2.1 ESC's. This fan includes a JR-2P male connector on a 45mm long lead. Features: 5V/13000RPM/ Max 7.2V Copper bush/non-waterproof plug:JR-2P male, wire length=45mm Specifications: Size: 25x25x10mm Input: 4-5 cell NiMH/NiCd or 2S LiPo Suitable ESC: Xerun 120A V2.1 or Xerun 90A V2.1