Aune Audio B-1 (B1 - 2016 Version) Class A Portable Headphone Amplifier With USB Charger (Black) - HiFi Battery Operated Amp New 2016 Version, with Improved Amplification for IEMs! Tested with many popular headphones such as HD650, DT990, SE535 and IE80 Class A Portable Amplification, Free USB Charger Check List of Authorized Distributors on the Following Link http://en.auneaudio.com/html/about_aune/join_us/ 1 Year Warranty Only From Aune Authorized Distributors