Three Loudness Levels: Screaming Meanie 220 offers three adjustable loudness levels: 70, 90, and 120 dB; the highest level is comparable to the intensity of a thunderclap or chainsaw at close range, ensuring you won't miss the alarm. Compact Design: With a measurement of only 6x2.5x1 inches, the Screaming Meanie fits easily in your pocket; features a convenient clip on the back for secure placement on a car visor or other locations.