I've used it a few times, but I haven't had the opportunity to use it since, so I'm putting it up for sale. Operation has been confirmed. It's convenient because you can also use earphones. Batteries are not included. ● Power: 2 AAA batteries (3V) ● External dimensions: 102 (W) x 59 (H) x 17 (D) mm ● Weight: 71g (including batteries) ● Battery life: Approximately 70 hours (when using manganese batteries), approximately 290 hours (when using alkaline batteries) (when tempo is 120, 4/4 time, and volume is at maximum) Please understand that this item has been stored at home. Since there is no original box, I will carefully wrap it in bubble wrap for shipping. Instrument: Metronome