1. Materials: first grade nylon plastic syringe. 2. Dose: 1ml, 2ml, 5ml, 10ml. 3. Dose adjustable: 0.1-2ml or 0.5-5ml adjustable continuous syringe. 4. Features: with 200 ml large & 100 ml small draw-off for directly inserting the liquid bottle to the fixed position, avoid secondary liquid pollution by straightly injection. Good feeling and touching operation handle. 5. Improved design: plastic syringe needle connector cap (needs to loosen the cap for inserting syringe needles) is replaced by metal fixing needle cover for directly insert the syringe needles for injection.