When you need a real irritating siren, you need the Super Siren Kit. It features one special IC that contains 3 separate transistors and a high gain power amp. Great for getting everyone's attention in the classroom! The siren sound is the pulsating automatic electronic type and features 2 separate sound adjustments. Size of board: 2.5" x 2.75". Operates from one 9V battery (not included). Complete with all parts, speaker, PC board and instructions. This kit requires soldering of components to the PC board while building. Skill Level 2.

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Note: Loud Siren Noises In Video at 0:02 Seconds