Made of safe material, this vacuum air pump is a very practical and professional, can be used for long time. It can be widely applied for electrical products, industrial products, vacuum fresh-keeping machine, and so on. Small in size and light in weight, very convenient to carry around to the places you want. Features - Color: black, silver. - Material: Aluminum alloy, copper, ABS. - Size: 8.30X6.00X5.00cm/ 3.26X2.36X1.97inch. - The small air pump is made of safe materials, very practical and sturdy for lasting use. - The noise of this vacuum pump is very small when it is working, and it will not cause additional interference. - Widely used for electrical products, industrial products, vacuum fresh-keeping machine, etc. - Compact size and light weight, very convenient and portable to carry to the places you need. - Excellent and stable working performance, low power consumption, offers you a satisfying using feeling. Specification - Working voltage: 9V~14V - Rated voltage: 12V - Rated : 500mA - Rated power: 6W - : 5L/min - Vacuum degree: 65kpa - Maximum pressure: 120kpa - Noise: <60db - Suitable for 4.5-6mm . Mainly about hardness. The largest part of the outer diameter is 6.5mm. Package list: 1 x Vacuum Air Pump