Koss BT539iK Wireless Bluetooth Over-Ear Headphones with Microphone and Volume Control - Dark Grey<div style="text-align: left;"><strong>[Product Information]</strong><br><ul><li>Full size， Wireless Bluetooth® Over-Ear Headphones</li><li>Bluetooth® 4.0 Technology</li><li>Built-in rechargeable lithium-ion battery， 12 hrs playtime， 40 hrs standby (at moderate levels)</li><li>Detachable cord</li><li>Fold flat for travel</li></ul></div><img src="http://ecx.images-amazon.com/images/I/31beDp2O1UL.jpg" noproxy><img src="http://ecx.images-amazon.com/images/I/415Avp5yLUL.jpg" noproxy><img src="http://ecx.images-amazon.com/images/I/31ARPpuuM-L.jpg" noproxy><img src="http://ecx.images-amazon.com/images/I/31PwM2f40qL.jpg" noproxy><img src="http://ecx.images-amazon.com/images/I/4110wI2GP9L.jpg" noproxy><img src="http://ecx.images-amazon.com/images/I/513XCV2qIpL.jpg" noproxy>