1.Voltage: 110V, 60Hz / Oil capacity: 250 ml / Power: 1/4HP | 2.Superior design on oil entering system: Oil and gas separated thoroughly, no oil mist, reduce pollution | 3.Large sight glass with scale: Minimum and maximum scale to avoid damaging vacuum pump and also improve your work efficiency | 4.Oil Anti Flow-Back Design: The gas inlet is specially designed to prevent oil form flowing back, preventing the container and hoses from being polluted | 5.Alloy aluminum casing and high volume cooling fan: Good heat dissipation to keep the pump running efficiently and for a longer life