Description: 
Voltage input range: DC0-25V
Voltage detection range: DC0.02445V-25V
Voltage Analog Resolution: 0.00489V
DC input connector: Terminal cathode connected to VCC, GND negative pole
Output interface: "+" then 5/3.3V, "-" then GND, "s" then the Arduino AD pins 

Arduino Test code:

# include

int val11;

int val2;

void setup ()

{

  pinMode (LED1, OUTPUT);

  Serial.begin (9600);

  Serial.println ("Emartee.Com");

  Serial.println ("Voltage:");

  Serial.print ("V");

}

void loop ()

{

  float temp;

  val11 = analogRead (1);

  temp = val11/4.092;

  val11 = (int) temp ;/ /

  val2 = ((val11% 100) / 10);

  Serial.println (val2);

  delay (1000);