Here is a Boss JS-5 Jam Station with it's Factory owner's manual & Factory power adapter in good condition. This JS-5 has been tested and works well but it has had a lot of use by a solo performer who performed mostly in nursing homes. It comes with a memory card.

Chrome AI says:

The Boss JS-5 Jam Station is a tabletop backing machine, drum machine, and phrase recorder designed for guitarists and singer-songwriters. It features 200 preset songs, 128 melodic instrument sounds, 16 drum kits, and a dedicated audio track for recording vocals or instruments.

Key Specifications: Sound Engine 32-voice polyphony; 128 melodic voices, 16 drum kits Songs & Styles 200 preset songs (4-part), 100 user songs, 200 preset styles Audio Recording Dedicated single audio track for guitars, line-in, or vocals Internal Memory Approx. 2 minutes (Hi-Fi mode) or 1 minute 58 seconds (Long mode) for audio Expandable Storage Up to 64MB SmartMedia card (Allows for over an hour of total audio recording time)Tempo Range20 to 260 BPM (96 PPQ resolution)Built-in Effects Reverb (8 types), Chorus (8 types), and Insert Effects (40 types)Inputs and Outputs

• 1/4" Input: Switchable for Guitar, Line, or Mic
• 1/4" Outputs: L (Mono) and R
• Headphone Out: 1/8" stereo mini-jack
• Footswitch: 1/4" jack (for FS-5U to control start/stop or loops)
• MIDI: In and Out ports