This circuit creates police, fire engine and ambulance sirens plus machine gun sounds. It's great for any sound effect needs and can also be used for alarm sounds for a security system. It includes a power transistor with heat sink for loudness and has a maximum output power of 10W. It can be powered by a 12V DC supply voltage and can therefore be used as an alarm for car security systems.

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Supply voltage: 6 to 12V DC / 1A (6 x "AA" batteries) Includes battery holder and heat sink Power consumption: < 50mA (stand-by mode) 4 tones: Police siren, Fire engine siren, Ambulance siren and Machine gun sound Maximum output power: 10W PC board dimensions: 2.57" x 1.72"