CentIoT® - 5V 10A Relay Module WITH OPTOCOUPLER - AC and DC Appliance Control - for Arduino DSP AVR PIC ARM T10A There are also two potentiometers

There are also two potentiometers on the board and one jumper (see picture)

4 M2 screws positioning holes for easy installation

It has an inbuilt over heating and over current protection

surge voltage design

CentIoT® - 5V 10A Relay Module WITH OPTOCOUPLER - AC and DC Appliance Control - for Arduino DSP AVR PIC ARM T10A There are also two potentiometersBrand: CentIoT Features: Operating voltage: DC 5V; Trigger current: 5mA; Normally open interface maximum load: AC 250V 10A, DC 30V 10A. Trigger Type: Low = ground level = logic 0 = logical false High = supply voltage (usually Vcc or Vdd) = logic 1 = logical true. This Module Is In Line With International Safety Standard, Control Areas And Load Area Have The Isolation Groove; Blue Kf301 Terminal Line More Convenient. Uses The Best Quality Relay; DC Or