After wearing the Naztech i9 BT Active Noise Cancelling Headphones for the first time, you'll never want to take them off! Crystal clear quality delivers opulent sound through these first-rate headphones that feature a completely wireless design with profound Bluetooth connectivity capabilities and a conveniently built-in rechargeable battery. Appreciate acoustic accuracy with the full-spectrum circuitry or simply sit in peaceful silence with spectacular active noise cancelling properties. Auditory Excellence! Features: • High-definition Sound • Premium Memory Foam & Genuine Leather Ear Cups • Superior Battery Life • Braided Fabric Shielded Cable • Foldable for Portability, Includes Travel Case for Storage • Continuous Audio Even after Battery Depletes • Detachable Cable for Cordless Noise Cancellation • Gold Plated 1/4" Stereo Plug Adapter • Gold plated Airline Dual-plug Adapter • Trilingual Packaging (English/Spanish/French) Specifications • Bluetooth Version: 4.1 • Bluetooth Chipset: CSR8645 w/apt-X • Noise Cancellation Rate: 85% • Speakers: 40mm Neodymium • Audio Impedance: 32 Ohms • Charging Time: About 3.0 hours • Charging: Micro USB • Cable Length: Detachable 4.8 feet • BT Operating Range: < 10 m • Connection: 3.5mm jack • Battery Time (Bluetooth Only): 15 hours • Battery Time (Noise Cancelling Only): 30 hours • Battery Time (Bluetooth + Noise Cancelling): 12 hours • Battery Type: Rechargeable Li-Polymer