void setup() {
  pinMode(4, OUTPUT); // Speaker pin
  pinMode(7, INPUT_PULLUP); // Button connected to pin 7
  pinMode(8, INPUT_PULLUP); // Button connected to pin 8
}

void loop() {
  static boolean alarmPlaying = false;

  if (digitalRead(7) == LOW && !alarmPlaying) {
    alarmPlaying = true;
    while (digitalRead(8) == HIGH) {
      tone(4, 3150);
      delay(500);
      noTone(4);
      delay(500);
    }
    alarmPlaying = false;
  }
}