The HD3 premium powered speakers are a mini home music system with high-fidelity true stereo sound for smaller spaces and desktops. It features wired or wireless connections, including Usb audio from your computer, extended-range wireless aptX-hd Bluetooth from your phone, tablet or computer, or good old analog from that turntable or prized tape deck. The HD3 system also features a high-quality headphone amplifier for private listening.