5-15V 40AMP switching power supply, with built in speaker. 220-240VAC version.
40 Amp Continuous Rating, 100% Duty Cycle. Variable Voltage Control 5-15 VDC. Voltage Control Knob has center detent at 13.5 VDC. Overload & short-circuit protection with Current Foldback at approximately 42 Amp. Over Temperature Protection; variable speed fan automatically controlled for quiet operation