It's Brushed Reversing ESC.include "brake" and "reverse" function.
Items :20A ESC
Weight :20g
Dimensions: 35.0*22.0*6.0

RC ESC 20A Brushed Car Motor Speed Controller 1/16 1/18 

Brand new and high quality

Items :20A ESC

Weight :20g

Dimensions: 35.0*22.0*6.0mm

Current(A):20A

working volt(V):4.8V-7.4V

voltage range(V):4.0V---8.4V

BEC :2A

PWM:8K

Input signal :PPM

Driver frequency:2KHz

Li-Po :2

Constant current 20A Max 25A< 30s Pulsed 50A< 5s

Li-Poly 2 cells;

Break On/Off;

Packing Content:
20A ESC Speed Controller *1set