Audioengine D2 Premium 24 bit Wireless DAC Power Conditioning Power Guard SGS helps prevent Power Guard SGS helps prevent premature vacuum tube failure by monitoring the screen grid current in the KT88 output vacuum tubes 11” (279 mm) Ultra high Excursion Driver with Trilinear Suspension System and Active Ridge Technology (ART™) 4 GHz digital wireless (no Wi Fi Bluetooth) Wireless Range Up to 100 ft (30 m) typical Audio Resolution Up to 24 bit 96 kHz (uncompressed) DAC 24 bit USB DAC (Sender) Frequency Response 20 Hz – 20 kHz Signal to Noise Ratio (SNR) >105 dB THD+N <0 Simply plug the D2 Sender into your computer's USB port and connect the D2 Receiver to your speakers or amplifier for an instant