You would think if you made a headset for the Motorola RAZR you would use the same power adapter. So even though you primarily use the headset in the car the genius that developed this product used a completely differnt plug. So if you have the car adapter to power your phone you have to buy a different car power adapter for this headset. Great thinking product team. I say look for the version that is cheaper then this one. It shares the same plug (universal USB) so you can charge it in the car as well.