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Alarm related PCB design

I made inverse engineering of this alarm (it's a sound semaphore for blind people). I need you to specify sound pattern of this alarm (single tone, bitonal, some patterns may be made using IC with no need of software, but others may require a microcontroller). To have that sound intensity you need an output power around 300 W, if you are using 8 ohm speaker you will need a power supply around 70 V and 10 A and a Darlington power transistor with a dissipator wich may be greater than 50mm x 50mm. Are you sure that alarm power is it?

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