1.Metal body with elegant design, reliable and durable. 2.High precision injection molding screw; Stable injection; Accuracy error is only 3% 3.Min. dosage 1U, dosage adjustable from 1u~60u. 4.Safe bi-directional dosage adjustment. Device reset automatically and while injection finishes. 5.suitable for both injection needles and injection pens, easy to replace. 6.suitable for 3 ml card bottle potting medicine liquid injection 7.Can be used over 2 years. Easy operation. Website: www.insulinpen.cn Tel: +86 51985857533 | Fax: +86 519 85857533 Add: No18 Huashan Road, Neoarctic region, Changzhou city, Jiangsu, China