The Diamond GZV4000 regulated, variable switching power supply provides 5 to 15 VDC at 40 amps continuous. Input voltage is 220V. Less than 8 mV ripple voltage. The back-lit meter can be switched to show amps or volts. A front panel access door hinges down to allow connection to the low amperage spring loaded clips or cigarette lighter jack. This supply features LEDs for power and overload conditions. The variable speed fan ensures quiet operation. This power supply even has a built-in 8 ohm speaker, making it a great space saver on your service bench.

Spesifications
Meter.
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. 
Fan for Quiet Operation.
Meter Selector allows monitoring of voltage & current.
Access to front panel DC Terminals and Cigarette Lighter Jack. 
Output for 8W Speaker.
Circuitry yields high RFI protection from external sources.
AC line filter for EMI protection.
Standard 3-wire Heavy Duty line cord. Power Indicator & Overload Indicator.
Accepts 220 VAC ± 20% 50-60 cps.
Ripple & Noise less than 8 mV r.m.s.

click here for GZV-4000 spesifications (PDF)