JBL SYNCHROS Black E40BT High-Performance Wireless On-Ear Bluetooth Stereo Headphone - Black (Certified Refurbished) This Certified Refurbished product is tested and certified to look and work like new, with limited to no wear. The refurbishing process includes functionality testing, inspection, and repackaging. JBL signature sound with PureBass performance and premium 40mm drivers deliver full spectrum sound with uninhibited clarity and powerful bass Bluetooth enabled technology for wireless calling and music play. Built-in Share Me technology allows you to share your content with another set of headphones, simultaneously Ear-cup-based microphone with echo-cancelation technology allows for hands-free calling with a pure connection to your wireless device for clear, hands free calling Built-in, USB rechargeable lithium-ion battery provides 16 hours of uninterrupted listening. And when the battery dies, the included aux cable allows for passive listening Ergonomic headband and protein leather ear-cushions provide an ultra-comfortable fit and effective noise isolation