Contents of the package include a single continuous syringe, two vaccine vials that cannot be reused, and an accessory bag. Product characteristics include: - Efficient continuous injection that minimizes the time spent on repeatedly filling liquid medicine, thereby enhancing work speed. - Accurate dosage control with a precision adjustment mechanism, allowing for dosage customization based on varying requirements. - Ergonomically designed handle that adheres to ergonomic principles, reducing fatigue during prolonged use.