Upbeat Audio Boostaroo T796 Portable Headphone Amplifier 3-Way Splitter USB/AC Powered Portable Audio Amplifier For Home, Office, Laptop, Or Kiosk Increases The Volume Of Any Player By 2x Works With Anything That Has A 3.5mm Headphone Jack And A USB Port Offers 3 Outputs Jacks For Use With 3 Headphones Or Speakers