TC-Helicon Go Solo, Audio/MIDI Interface, For mobile devices, PCs and Macs, 24-Bit/48 kHz, Built-in microphone preamp (Midas Design), Phantom power: +48 V, Monitoring in real time, Gain control: 0 to +50 dB with clip LED, USB Audio 1.0 Class Compliant, Powered via 2x AA batteries, USB or optional 5V DC 2.5A