This be Emergency power siren Circuit 6 watt sizes. It use Digital IC number IC 4011 perform produce the frequency pulse generator, be beep danger character. And have power mosfet wasp use a loudspeaker 8 ohm sizes and are large-sized loudspeaker. for have a voice as the last. For power supply Source use 12 Volt sizes that have can give current get tall about 1 Amp a little like and Power Mosfet should hold let off the heat with. The detail is other , friends , see in the circuit has yes.