If you have a Motorola Razr, you will need an adaptor to use the battery charger or to use the AC charger you already have with the Razr. It does come with its own AC charger so you don't absolutely have to have it. I've only used it for one day (got it yesterday) and already I see a huge improvement between it and the Motorola H700 I had. The reception is better and it's clearer. And it holds the charge longer. I recommend it if you will use the handsfree option a lot like I do. And I was able to keep my Razr in my briefcase and it found it!