49 Keys Roll Up Piano Foldable Portable Hand Roll Piano with Built-in Loudspeaker for Kids/Adults/Beginners Features： Built-in 16 kinds of tones, 10 kinds of rhythms, and 6 demos for learning and listening to the classics. Standard 49 keys roll up piano, perfect for kids, adults and beginners. Multiple functions: one key one note, 16 levels of volume control, 32 levels of speed control, 3 sound effect modes (echo, mixing, vibrato), rhythm editing, recording, etc. Support external connection of earphones, audio, and microphone input. Built-in loudspeaker, mellow and melodious sound. Small and lightweight, foldable and potable, easy to carry it around, play whenever and wherever. Specifications： Color: Black & white Material: Silica gel Power Supply: 3 AA battery (Not included)/ DC 6V adapter (Not included) Product Weight: 720g/ 25.3oz Control Box Size: 22.2 * 10 * 2.2cm/ 8.7 * 3.9 * 0.8inch Keyboard Size: 73 * 17.1 * 0.3cm/ 28.7 * 6.7 * 0.1inch Package List： 1 * Roll Up Piano