You can customize the sound of the siren by eliminating any of the six tones. Remove the two little screws surrounding the horn. Remove the 8mm, and use a pick to pop out the grommet on the wires. Tap the siren on the ground and carefully seperate (sic) it from it's housing. You can preview the tones by connecting the siren wires to your drill's battery or the car battery. Inside, you'll see a row of six loops. Clip a loop to eliminate a tone. I get rid of the most annoying of the tones: J4 and J6.