Bought for a home studio but was never used. (NB this has the Focusrite 192K AD/DA built in)

Top end mic pre. Comes in a neat little factory hard/roadcase (with all original packaging, docs, etc)...

Details from Focusrite Site:

The ISA One microphone preamplifier delivers Focusrite's prestigious ISA transformer-based preamp in a rugged and portable chassis, at a groundbreaking price.

ISA One features the classic vintage microphone preamplifier topology from the original ISA110 module, which formed the cornerstone of each channel of Focusrite's legendary Forté console.

The preamp is complemented by a line input and an independent D.I. channel, complete with dedicated gain control, active or passive impedance switch, a TRS Jack output for routing to an amp and an independent XLR output on the rear. This flexible independent D.I. makes the ISA One ideal both for engineers wishing to blend a D.I.’d guitar signal with a mic’d guitar cabinet, and for demanding performers who require a single classic solution for both guitar and vocals.

Stereo 192kHz A-D converter
Cutting-edge conversion technology, incorporating Focusrite analogue circuitry to deliver the best A-D performance in its class (dynamic range of 119dB).

Flexible independent D.I. channel
ISA One is ideal for both engineers and demanding performers alike, featuring independent gain control, an output for routing to an amp, an independent XLR output on the rear and routing to the optional A-D converter.

Headphone output with volume control
ISA One can feed either a sum of the two inputs to the headphones output, or an external stereo cue mix (such as a stereo mix feed from an interface) via two TRS Jack inputs on the rear of the unit.

Dedicated insert point Allows you to place extra processing between the preamplifier or DI and the optional converter...