Lightly used. There are Velcro strips affixed to the bottom (last two pics) I used for attaching to my pedal board.

Product information:

SIMPLIFIER MK-II (mk2): The State-Of-The-Art on Analog Amp simulation The Simplifier MK-II takes the analog amp simulation to a new stage of realism. Many more options, while keeping the instant touch and dynamics that only an all analog device can manage. All...in the same ultra compact footprint. A dedicated power amp drive allows you to dial-in the perfect amount of power amp compression for that sweet-spot that only a tube amp can achieve. This control sets a new level of realism engineered only by DSM Humboldt. DSM Humboldt Electronic's Simplifier MK-II Jam-packed with the same amp, power amp, and cab simulations as well as a bevy of new controls, the Simplifier MK-II brings the same meaty tone to any pedalboard with much less hassle. Three excellent preamps include AC BRIT, American, and MS Brit characteristics without the need of any additional hardware. These particular sounds are best paired with the MK-II's dedicated power amp drive, which offers even more fine-tuning with an upgraded power type switch and linear through distortion drive knob. Similarly, the Simplifier's stereo cab sim combines combo, twin, and stack selection with color selection options to deliver independent cab voicings for the left and right channels. Best of all, DSM Humboldt made sure to include adjustable plate reverb to add the perfect amount of room control to your setup for complete authenticity. If you're looking to venture into silent stage rigs or need a lightweight and compact amp, check out the Simplifier MK-II. A trio of redesigned preamp engines If you're familiar with the OG Simplifier model, there's no surprises here. The Simplifier MK-II hosts three separate preamp options and a 3-band EQ to ensure top-notch voicing for any scenario. AC Brit: A sweet, sparkling voicing based on a British icon known for its twinkling cleans and emotive verge-of-breakup grind. American: Supplies the quacky midrange and chunky bass of black-panel Deluxe. Sweet when clean, roars when pushed. MS Brit: Packs on the glassy gain and forward character of a Plexiglas-paneled vintage amp stack. Power amp simulation control Tonal possibilities on the Simplifier MK-II don't stop at the preamp. An onboard power amp allows you to dial in the perfect amount of compression and stiffness. The power type switch provides reconfigurations to your feedback path, PI gain, and power transformer effect to get the most out of your tube-emulated tone. The helpful clip indicator will also ensure you're kept aware of any clipping issues, making it even easier to find the sound you're looking for without unnecessary noise. Enhanced stereo cab sim control The Simplifier MK-II's Combo, Twin, and Stack cab simulation controls are an excellent way to add a tight boost to your final sound. The OG Simplifier's MIC position control has been replaced with a Speaker control (Black, Blue, Green) based on an Eminence blackface, a Blue Alnico speaker, and the G12 Greenback speaker, respectively. Additionally, three separate classic cab types are available in combo, twin, and stack configurations so you're ready to hit any venue with confidence. Built-in digital reverb Fans asked, and DSM Humboldt Electronics delivered. A dedicated reverb knob along the Simplifier MK-II's return connections provides crisp side-chained digital plate reverb to administer impressive width and a touch of room to your instrument's tone. Stereo direct amp pass-through Let's say you want to run direct to the soundboard but still monitor yourself through cabs. Or, maybe you just want to monitor from your pedalboard and mic up cabs from the stage. The DSM & Humboldt Simplifier MK-II is able to pass your stereo effects pedals directly onto your powered stage amps to provide a rich, stereo spread. Auxiliary input Practicing along to jam tracks? Monitoring MultiTracks in your in-ears? The Simplifier MK-II's auxiliary input lets you live monitor songs from your music library and audio from your DAW while you play, saving the need for a dedicated in-ear system. DSM Humboldt Electronics Simplifier MK-II Stereo Amplifier Features: Compact analog preamplifier with amp simulation An upgraded take on DSM Humboldt Electronics’ Simplifier Classic amplifier An excellent option for travel, late-night practice sessions, and silent stage rigs 3 redesigned preamps with enhanced gain options (AC BRIT, American, MS Brit) based on classic amps Dedicated power amp drive delivers the perfect mix of compression to achieve realistic tube-style tone Monitor your performance with a convenient clip indicator Master control section provides improved presence and resonance parameters and a volume knob Onboard side-chained digital plate reverb adds room sound to your output Improved stereo cab simulator includes three speaker-based profiles: Black (vintage Eminence blackface), Blue (Blue Alnico Speaker), Green (G12 Greenback Speaker) Heavy-duty all-aluminum enclosure with all metal switches survives the test of time Built-in headphone amp for silent practice and/or pedalboard monitoring Tech Specs Pedal Type: Modeling Preamp Analog/Digital: Analog EQ: 3-band EQ, Presence, Resonance Amp Modeling: 3 x Amps, 3 x Cabinets, 3 x Power Amps Inputs: 1 x 1/4" (instrument), 2 x 1/4" (return L/mono, R), 1 x 1/8" (aux in) Outputs: 2 x 1/4" (L/thru, R/sum mono), 2 x XLR, 1 x 1/4" (send) Headphones: 1 x 1/8" Power Source: 9V DC power supply (sold separately) Power Usage: 150mA Height: 1.8" Width: 2.7" Depth: 4.7" Weight: 0.8 lbs. Manufacturer Part Number: DSM-SIMMKII