Product parameters:
Size: 33.4 * 25.6MM
Voltage: 3.3V, 5V
Port: the digital quantity level
The output load voltage: 0 to 24V
The output load current: <5A (more than 1A need to add heat sink)
Platform: the Arduino, MCU, ARM, raspberry pie

The product instructions:
PWM signal for high level effectively
When the PWM for high level (3.3 V to 3.3 V) :
As the power supply voltage, between V + and V - working indicator, work load
When the PWM is low level (0 V to 0.5 V) :
V + and V - between 0, work lights out, don't work load

Package included:
10PCS x IRF520 Module