REMARKABLE SOUND - 1? silk dome tweeters and 4? Kevlar drivers deliver crisp highs and a wonderfully balanced mid-range, faithfully reproducing all your favorite tunes. BLUETOOTH 4.2 APTX - Along with a single RCA input for all your analog devices, YU features Bluetooth 4.2 with Qualcomm aptX technology, letting enjoy high-quality streaming from the palm of your hand. SIGNAL DETECTION - Automatic standby and power-up modes help to conserve power when you?re gone and ensure you never miss a beat when your music starts playing. Simply hit play on the previously connected source and YU will handle the rest. REMOTE CONTROL - With volume, input, tone and balance controls, as well as playback options while using Bluetooth, the YU remote gives you full control over your audio. SIMPLE INTERFACE - YU's user-friendly interface features a single knob. Simply rotate for volume, push in to switch between inputs, or push and hold to activate and deactivate standby mode.