The Outdoor Tech 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 Tech added a built in microphone so you can take calls without holding your phone, and the 3. 5mm 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.