Preium Wireless Bluetooth 4.0 Headphones. 40 mm drivers deliver most premium Hi-Fi full range of clear sound, wirelessly. Connect to any Bluetooth-enabled device with easy one-touch pairing. External controls allow you to adjust volume, change tracks, play/pause and answer calls. Rechargeable lithium-ion battery. Built-in microphone. The Outdoor Technology Tuis Bluetooth Headphones deliver crisp sounds without the wires. It connects to any Bluetooth-enabled device at the push of a button, and external controls let you adjust volume, change tracks, and play or pause quickly. Outdoor Technology added a built-in microphone so you can take calls without holding your phone, and the 3.5 mm auxiliary jack lets you listen to music on airplanes and other places that don't allow wireless connectivity. Integrated hinges let the Tuis fold for compact travel, and the rechargeable lithium-ion battery provides sixteen hours of play time and four-hundred hours of standby time. Color: Black