Specification:Motor type: DC motorMaterial: Metal motor+Plastic pump head+Silicone tubeVolatge: DC 12V Item type: D1 tube; D2 tube; D3 tube;  D4 tube; D5 tubeParameter: as picture shownSize: as picture shown[Conversion: 1cm=0.3937 inch, 1inch=2.54 cm] Feature:в—†Silent work,suitable for aquarium, chemicals, liquids, dosing additives.в—†The pump head designed for easy disassembly, easy to clean and maintain.в—†You can control the flow direction by the positive and negative connect. в—†Widely applied in experiments, biochemical analysis, pharmaceutical, fine chemical, biological engineering, products, ceramics, water treatment, environmental protection, powders, and other fields.  Packaging included:1 x Mini Peristaltic Dosing Pump Note:-Due to different producing batches, product details might be a little different. If you mind the difference, please buy it carefully.-Due to the different display and different light, the picture may not reflect the actual color of the item. Thanks for your understanding.