The "Y" Charger Adapter plugs into your mini-USB charger so you can charge your RAZR phone and Motorola headset in the same outlet at the same time. It works great with a car charger, especially if you cannot plug in two adapters at the same time. It is also small enough to be portable so you can use the same one with your standard charger at home as well.Just be careful that your phone and headset use these specific plugs, not all phones and headsets are the same. Amazon sells a different one with 2 CE bus ends to use with older Motorola phones. If only they had one with 2 Mini USB ends to use with the newer headsets!