speed controller ESC(electronics speed controller) Model Size(mm) Weight(g) Curent(A) Cell/servos NiCd/NiMh Cell/servos Li-xx GE-ESC 10 Plus22X17X4710( ... )6/4,8/4,10/22/4,3/3GE-ESC 25 Plus32X23X72125(30)6/4,8/4,10/22/ ... 4,3/3GE-ESC 30 Plus42X23X72830(40)6/4,8/4,10/32/ ... 2-6/-GE-ESC 70 Opto52X25X124070(90)6-16/-2-6/-GE-ESC 90 Opto52X25X124290(120)6-16/-2-6 ESC(electronics speed controller)