This be Water Sensor Alarm Circuit for warn the water level , by when sensor point touch the water or the rain. The circuit have a voice loud warn hear immediately. By this circuit uses the integrated circuit LM380 , usual use be power amplifier IC the small-sized , seek buy easy , be usable not difficult. For friends loudspeaker choose use 8 ohm small-sized all right. For power supply source 9V sizes arrive at 12V all right. The detail is other , see in the circuit better yes.