Focusrite ISA One Classic Single-channel Mic Pre-Amplifier with Independent D.I. ISA Series transformer-based preamplifier: Focusrites classic ISA preamp design based on the original ISA 110, in a highly cost-effective and flexible package Flexible, independent DI channel: independent gain control, output for routing to an amp, independent XLR output on the rear, and routing to the optional A-D converter Optional stereo 192kHz A-D converter: upgrade with an optional digital card that delivers the best A-D performance in its class, with a dynamic range of 118dB Switchable impedance: four input impedances that help shape your sound, including that of the original ISA 110 Dedicated insert point: allows you to place extra processing between the preamplifier or DI and the optional converter, such as an EQ or compressor; 2-year limited warranty on manufacturing defects