Over Ear Bluetooth Headphones, TaoTronics Bluetooth Headset with Dual 40 mm Drivers, Lightweight Headsets with Soft Protein Ear Pads, 22 Hour Playtime, Foldable, Wired & Wireless, Built-in Mic Audiophile-Grade Sound: A finely tuned audio symphony pairs with an advanced CSR Bluetooth chip and dual large-aperture 40 mm drivers