Sabaj Small Desktop Stereo Audio Digital Amplifier AMP with Bluetooth USB Optical Input Black Silver With optical bluetooth analog Input, Class D digital amplifier with remote control and antenna TPA3116 amplifiaer chip,WM8524 DAC chip and LC89091 digital optical recieving chip.sampling rate is up to 44.1KHZ-192KHZ Body all made of aluminum scrub,effective screen disadvantages battery interference, so that sound more pure. Well selected nichicon capacitor.custom-built air core inductance.Golden RCA and pure copper speaker terminal. Visualized LED digital screen.Simple design but high-quality workmanship Covers failures due to power surge and other mechanical and electrical breakdowns. No deductibles or hidden fees. Shipping included on all repairs. Fully transferable. Easy claims process online 24/7. If we can't fix it, we will send you an Amazon e-Card reimbursement for your product purchase price. Plan term and select coverage begins date of purchase and is inclusive of the manufacturer's warranty. All other coverage begins after the manufacturer's warranty expires. Plan is fully refunded if canceled within 30 days. Plan contract will be emailed from Asurion within 24 hours of purchase. This will not ship with your product.