THE BLASTER is 1.8 ounces of raw power in a convenient size (5 1/2" tall by 1 3/8" wide) to take along on walks, bike rides, or for any event where you need to "stand out from the crowd." With up to 200 loud blasts, THE BLASTER lasts a long time. The special "two sounds" feature allows you to remove the bell from the horn top for a piercing whistle that becomes a strong signaling alarm.