Here is an Alesis MidiVerb III 1 space rack mount stereo effects processor with it's factory adapter in very good condition.

Brave AI says features include:

Audio Performance

• Resolution: True 16-bit
• Frequency Response: 16 Hz to 15 kHz ±1 dB
• Dynamic Range: 85 dB
• THD: 0.1% typical at 1 kHz, 0 dBV
• Sampling Frequency: 31.25 kHz 

Memory and Processing

• Memory Locations: 200 total (100 factory presets, 100 user-editable)
• Processor Speed: 2 million instructions per second
• Configurations: 15 signal path options allowing various combinations of effects 

Controls and Interface

• Front Panel: Three rotary knobs (Input, Output, Mix), three-digit LED display, and buttons for Program, Store, Edit, and Effects selection. 
• LEDs: Signal Present and Clip indicators. 
• User Interface: Simplified front-panel control to avoid complex menu diving. 

Connectivity

• Audio I/O: Left and Right 1/4-inch inputs and outputs. 
• Bypass: 1/4-inch jack for footswitch control. 
• MIDI: MIDI In, Out, and Thru sockets for program mapping and real-time parameter control. 
• Power: External 9VAC, 1A transformer.

Physical

• Form Factor: 1U, 19-inch rack mount. 
• Weight: 2.9 kg.