Oblanc Cobra Amplified Subwoofer 2.1 Stereo Headphones with Built-In Battery: * 2.1 amplified stereo channel with independent bass * Gold-plated 3.5mm 4-pole connector * Compatible with smartphones and tablets * Extreme comfort and fit leatherette ear cups * 2 Neodymium drivers in each ear cup * Volume controls * Tangle-free cord with in-line microphone and call control * Rechargeable 450mAh battery (up to 10 hours per charge) * Acoustic Design: Dynamic, closed-back * Frequency Response: 20-20KHz * Maximum Input/Output Power: 200mW/40mW * Cable Length: 62" * Color: Black