Oil-free Air Compressor HK-6EW-90 (one to four) 1)High durability 2)Low /no ... )Profession making,Energy conservation Oil-free Air Compressor HK-6EW-90 (one to three) Specifications:Supply voltage..........................................220V AC 50HZElectric ... 90LNoise.......................................................60~70dB Oil-free Air Compressor HK-6EW-90(one to four)