FOUR EQ MODES FOR RICHER EXPERIENCE: Volume-optimized EQ gives you a consistent, balanced performance. Match your music with Bass, Treble, Rock and Natural styles. KEEP ON PLAYING: Built-in rechargeable battery provides up to 13 hours of playback and 18hours talking. You can either go wireless with Bluetooth technology or plug in with the provided 3.5mm aux cable. OVER-EAR COMFORT AND STYLE: Cushioned memory protein ear pads and adjustable headband cover your ears for extended comfort when you immerse yourself in the music.