This MOSFET help you drive High voltage & Large current modules such as DC motors, LED strips, water pumps with microcontrollers. MOSFET is also a kind of switch, but its switching frequency can reach up to 5MHz, much faster than normal mechanical relay. There are two screw terminals on the board. One for outer power source and the other for device you want to control. You can use this module to control your DC motor speed or LED lightness with Arduino.

NOTE that Heatsink is needed when current larger than 1A, the Heatsink is not included