I bought this on the good reviews it got from other buyers. BUT be warned. I have a Navman s70 and though it appeared to charge, the Navman kept displaying a cross (X) icon. The first time I came to use my sat nav after this charging; it locked up. Completely froze. I had to force it into shut down and then charge from the offical Navman car charger. Thankfully, after a proper power supply was given, it recovered. But I wouldn't advise anyone to risk losing such a high value item just for the ability to charge it at home. Just use the car charger that came with your sat nav!