This is a green KORG Rhythm Master, designed to teach rhythm through sound and light. - Brand: KORG - Product Name: Rhythm Master - Color: Green - Features: Learn rhythm through sound and light Key Features "Rhythm Master" - 5 Key Features! Ease of Use is also a Charm Flowing light evokes the movement of a club Easy to understand the initial beat Sound with lingering resonance evokes the movement of a club Easy-to-use button layout Battery-powered for portability Tempo Range: 20-80 bpm Volume Control: Volume knob (can be muted) Power: 4 x AA batteries Battery Life: Approximately 200 hours (with alkaline batteries, tempo 60, count sound t1, maximum volume) Operation has been confirmed. I used it a little, and I'll include the batteries. I purchased it in January 2026 and used it outdoors for about an hour. This is a used item, so returns and exchanges are not accepted after purchase. Please understand this before purchasing. The delivery note only includes images because it contains personal information. It cannot be sent along with the item. Please understand. Thank you for viewing.