1. suitable in the frequency parking lot system
2. varied of model for choice
3. comprehensive inner controller ,convenient for maintenance
4. the crust of pole is made of aluminium ,can be installed on both sides .flexible and simple
5. linearity adjust of spring ,balance and steady
6. available storage battery for sudden power cut easily
7. mechanism and electron adjust
8. control with switch, simple structure and solid
9. prepare the convenient safe key ,have good defend effect
10. the hull is absolutely made of plating coat and AISI304,good looking and solid