What exactly are you looking for regarding? They are awesome units, dsi, structure scan, touch screen for control, gps mapping and no need for an lss1 or 2 cause the networking is built into each head unit. Additionally, go free wireless units are available that let you view and control the unit on iPhones, ipads and android devices. IPhones and I believe android devices are view only but ipad is view and control. Hope that helps.