ST400 series have models ST400 and ST401. This model is about ST401, the one with dual lanes. ST401 is dual mechanism, works together with ST400 to form multiple lanes. ST400 series are designed for elegant main entrance solution for factory, office building, school and gym etc. The ST400 with transparent acrylic barrier and LED light on the cabinet show great fashional style when installed on the site. It is also water-proof, can works outdoor. Because of the modular design, the device is easy to install and maintain.