Mace Screecher Aerosol Alarm emits an ear piecing blast readily recognized as an emergency call for help. The mace screecher aerosol alarm has a high pitched shriek that can be heard up to 1/4 mile away. The mace screecher aerosol alarm is of a convenient size for pocket or purse. This Screecher alarm is a 10 gram unit and has a push top activator and contains approximately 30 short blasts. Size 4.75 x 0.875".