Peachtree Audio SHIFT Portable Headphone Amplifier and USB DAC Compact and portable. Ultra-low-noise amplifier powers headphones from sensitive in-ear monitors to "difficult to drive" over-the-ear models. Hi/Lo gain setting matches low impedance or high impedance headphones. High-resolution asynchronous USB DAC for playback of music files up to 32-bit/384 kHz PCM and 5.6 MHz DSD. ESS Sabre32 Reference DAC with patented Hyper Stream Modulator and Time Domain Jitter Eliminator creates natural, life-like sound. Switchable output. Listen to headphones or connect directly to your desktop speakers or Hi-Fi system. Built-in 4100 mAh battery provides up to 8 hours playing time on a single charge. "On + charge" setting charges your iOS device while listening. Attractive and durable leather and aluminum enclosure. Leather carrying case included.