def start(self, seconds=300):
        """
        Starts timer.
        If timer is already running it will increase remaining time instead.

        :param int seconds: Initial time.
        """
        if self.state is TimerState.stopped:
            self.compare = time.time() + abs(seconds)
            self.state = TimerState.running
        elif self.state is TimerState.running:
            self.increase(seconds)
Starts timer.
        If timer is already running it will increase remaining time instead.

        :param int seconds: Initial time.