Specification: 1pcs brush speed controller. Function: forward, reverse, brake working voltage: 3.0V---9.4V. Diaensions(L*W*H): 35.0*22.0*6.0mm Current(A): 20A,30A Driver frequency: 2KHz Input: Li-Po 2S / Ni-Mh/Ni-cd 4-7cell Constant current 20A Max 25A< 30s Pulsed 50A< 5s Brake On / with brake This ESC can work with 130/180/260/280/380 Brush Motor Size:20*20 MM   Package Includes: 1*Brush Motor Speed Controller