The police??!!

const int ledpin = 9;

const int redpin = 11;

const int buzzer = 3;
void setup() {
  // put your setup code here, to run once:
pinMode(ledpin, OUTPUT);
pinMode(redpin, OUTPUT);
pinMode(buzzer, OUTPUT);
}

void loop() {
 // put your main code here, to run repeatedly:
digitalWrite(ledpin, HIGH);
digitalWrite(redpin, LOW);
tone(buzzer, 450);
delay(400);
tone(buzzer, 600);
digitalWrite(ledpin, LOW);
digitalWrite(redpin, HIGH);
delay(400);
}