Purchased around 2016. I am selling this because I have no use for it. It will be shipped without a button battery. I have confirmed that it works, and there are no problems. The product has been opened and used a few times, so please understand this before purchasing. The following is a quote of the product information: Standard Pitch: C to B notes (12 notes) One-touch sound (410-450Hz) Tempo: 30-250/min Time Signature: 0-7 beats, 2-4 tuplets, 2-note afterbeat, 3-note omission, 4-note omission Tap: Yes Features a dial-type volume adjustment function. Volume control is possible with one hand. Three-dimensional shape with a stable stand function on the bottom of the back. Width: 92mm Height: 56mm Depth: 24.5mm (maximum point of the stand on the bottom of the back) Weight: 52g Power: CR2032 lithium battery