Seaboltd AC220V 1/2" US Plug Compressed Air System Electronic Automatic Timed Drain Valve with 1.8m Length Cable Air Compressor Tank Drain Valve Power supply voltage: 220V AC 50/60Hz Widely used in filters, separators, dryers, gas tank, drip legs and other compressed air system comp There are test button and the intervals, emission time adjustment knob The current consumption of the largest 4mA