This is the Seiko digital metronome "DM71L" (Aqua Blue). It's a convenient card size, perfect for carrying around, and has features useful for practicing all kinds of instruments, such as in brass bands and orchestras. ★ Main Features and Specifications - Tempo Range: Adjustable from 30 to 250 beats per minute. - Beat Settings: Can be set from 0 to 7 beats. - Reference Tone: Can emit reference tones (12 tones from C4 to B4) for tuning. - Earphone Jack: Equipped with an earphone jack (PHONE terminal) for external output. - Visibility: High-contrast LCD and LED light allow you to visually confirm the tempo. - Operability: Designed with a small number of buttons and a simple layout for easy one-handed operation. - Power: Uses one CR2032 lithium battery (operation confirmed). - Size and Weight: Approximately 54(W) x 86(H) x 12(D)mm, and weighs about 45g (including battery), making it thin and lightweight. - A stand is attached to the back for upright use. - Price: 3630 yen Used a few times and stored at home. The battery is included, and operation has been confirmed. Please consider after checking the images. ※ No instruction manual or box included.