Dymond Powerful Futur-E brushless speed controller which can handle 50 A cont and 60A burst. Opto coupling for safe operation (no BEC). 2-6 cell Lipos. Ultimate BEC or receiver battery required. 6-20 NIMH or NICAD cells. Fully programmable or use with built in self detect and auto adjust. 46x35x8 mm, weight 46g. Large dimensioned heat sink for cool operation. Dont get fooled by the low price. This unit is an excellent performer.