With the Beats by Dr. Dre Studio Wireless over-ear headphones the music on your iPhone, iPad, or iPod can truly roam free. The Bluetooth stays connected up to 30 feet away so you easily move about and keep the music going. Take calls, skip songs, and change the volume right from the headphone. The built-in rechargeable battery that can last up to 12 hours when using wirelessly and 20 hours when you do decide to plug in so you can be sure your vibe keeps going. With the Battery Fuel Gauge you can see at a glance how much juice is available. Plus, you can charge the new Studio via standard micro USB adapter almost anywhere. Each Studio 2 has a unique serial numberthat can be registered with Beats.