BOSS DB-88 Dr. Beat Digital Metronome Rhythm Machine This is a BOSS metronome. You can adjust the click sound and accent volume to your liking. Unfortunately, the back cover is missing, but it doesn't affect use, so I'm listing it. 【Condition】 ・Scratches/stains/signs of use/age-related deterioration/present ・The 9V battery back cover is missing. ・Both 9V battery and PSA adapter operation have been briefly confirmed. ・Batteries and adapter are not included. ※※※※※※※※※※※※※※※※※※※ This is a used, as-is item as described above. If you think you might regret the scratches that are not visible in the photos, please purchase from a store. This is a junk, used, as-is item that requires maintenance. Thank you for your understanding.