we offer parking system,patrol system and door access. The humanization clutch make you losen the barriers bar conveniently.After open the humanization clutch,You can up or down the bars by hand easy,The control system can be reset automatically when power on. b.Special craft machine core with the mech anism and the electronic technology and use compress spring,Compress spring prevent the system accident from the drawing spring baeaking,which is often happen. c.three keys control the barriers bar up,down and stop. d.Pototest,the best possible solution for safety. e.Vehicles detector connection. f.IC card connection. g.Red and green traffic lights connection. h.Radio control or line key control selection. i.RS-485 communication.