Built-in rechargeable battery.
61-Key Foldable Digital Electronic Piano Full Size Portable with Handbag Black Introductions: 61 Key Semi-weighted Keys Foldable Electric Digital Piano is made of aluminum frame and premium PC keys for years of use.8 in x 4. So you can play it anywhere anytime Specifications: Keyboard: 61-Key Color: Black Piano Material: Abs PC Aluminium Piano Bag Material: 600D Oxford Cloth Piano Dimensions: 35.