At just over 28 seconds, this clip provides enough siren movement for a sustained chase or several shorter cuts. The MP3 can be downloaded, stored locally, and played offline whenever needed. Trim a compact section if your phone requires a shorter notification tone, or keep more of the cycle for a ringtone. Because the alternating tones occupy plenty of attention, lower them beneath dialogue and game audio. For a deliberately exaggerated sequence, pair the ending with a censor beep or MLG air horn.