COMPACT FORM Due to the custom operating system and dual-path circuitry design, the CPU and control circuitry consumes a minuscule 10ma, meaning that 95% of the R2R-2000's electricity is directly channeled to the audio components. This means the R2R2000 is not only efficient, but it doesn't require a huge battery to provide long-lasting power while maintaining audiophile quality. UP TO 35 HOURS PLAYBACK TIME HiFi Mode offers the very highest audio quality but reduces playback time to up to 8 hours. For longer listening sessions, the R2R2000 offers an Eco Mode that reaches up to an astonishing 35 hours of playback while still sounding better than the competition. FAST CHARGING The R2R2000 uses a USB-C connection at 2A-5v, fully charging from empty in under 1 hour. All this and more in this amazing product. The USB DAC is so good we use it to feed the Shangri-La at the shows. It outperforms products way above its price class. The R2R is a true game-changer for home, office, or on the go.