I have purchased two units from autodvdgps.com. One worked fine in a 2010 Corolla, the other in a 2006 Merc Montego would not power up. The issue is the design of the "plug n play" wiring harness that they provide to make installation straightforward into the cars existing wiring connectors to the stock radio. Be aware that you are dealing with a company based in southern China (Shenzhen). The warranty is almost meaningless because if you return the unit, they will charge you 30% of the purchase price if you ask for a refund. NOT good!