This is a DC motor speed regulator, which based on the IRF3205 power MOSFET, the max power up to 400W, it is really good to control your motor.
Features:
Input voltage: DC 12-40V
Output voltage: 0-100%Input voltage
Power: 0.01-400W
Rated Current: 8A (Max current:10A Static current:0.02A)
Frequency: 13khz
PWM: 10%-100%
Onboard with 10A fuse