Big Blue Bluetooth Amplifier. Improves headphone sound. Lets you go wireless. Allows wired headphones to wirelessly connect to Bluetooth enabled devices Hi-Res audio lets you enjoy more range in your music (up to 384KHz/32Bit) Built-in li-ion battery lasts up to 10 hours per charge Digital volume control for precise adjustments Bluetooth aptX technology ensures incredible sound quality Features SPDIF In/Out, Line In and USB In connections USB charging cable and travel pouch included Specs: Input: SPDIF In, Line In, USB In Output: SPDIF Out Battery: Up to 10 hours per charge Pairing: Bluetooth 4.1, NFC Audio Rate: Up to 384KHz/32Bit Wish your headphones or earbuds sounded better? Well, our Big Blue Amplifier is here to make your wish come true! This pocket-sized amplifier improves sound quality and gives you precise volume control so you can enjoy your music more fully without having to spend a ton of money on new headphones or earbuds. But it doesn't only improve sound quality--it's also Bluetooth enabled so you can connect wired headphones to your device wirelessly! Order your Big Blue Amplifier from Brookstone today! Big Blue is a registered trademark owned by Big Blue Audio LLC. The Bluetooth word mark and logos are registered trademarks owned by Bluetooth SIG, Inc. and any use of such marks by Brookstone is under license.