Remove the dedicated connector of the navigation unit and insert it in between with a single touch. This is a coupler type, so no wiring is required. (Body grounding and switch mounting work. The switch needs to be drilled for installation *If you are not confident in installation, please consult a professional automotive seller or a qualified mechanic. ■Compatible models: DSZT-YC4T, NSZA-X64T, NSZN-W64T, NSZT-W64/Y64T, YA4T, Y62G Prius, Esquaire, Alphard, Verfia, Boxy, Estema, Vitz, Aqua Wish, etc. ■ Even while you drive, you can watch the TV and switch to navigate navigation with the switch, and the passenger seat will not get bored. (Please do not look at the screen while driving.