Digital Metronome DM50, pink, uses CR2025 battery. Operation has been confirmed, but the battery (CR2025) is not included. Also, although the period of use was short, it is an old item, so there are stains due to age-related deterioration. Please purchase after understanding that it is a used item. Please consider before buying, if you are particular about product condition. - Model: DM50 - Color: Pink - Function: Digital metronome - Battery: CR2025 - Manufacturer: SEIKO SPORTS LIFE CO.,LTD. Thank you for looking.