Portable Silicon 61 Keys Roll Up Piano Electronic MIDI Keyboard with Built-in Loud Speaker Features: 61-key(C3-C8) portable roll up piano, convenient storage and easy carrying. Silicon keyboard with thickened design, more real and more comfortable feeling. Features 45 demo songs, 128 kinds of rhythms, 128 kinds of tones. Supports recording, teaching, playback, OOP, sustain and vibrato functions. Supports single finger chord and multi-finger chord. With LED display showing the relevant parameter information. With built-in speaker and headphone jack for connecting earphone or external speaker. With MIDI output and audio input interfaces. Power-saving function, automatically power off if no operation in 3 minutes. Can be powered by 4 * AAA 1.5V battery(not included) or power adapter(included). Specifications: Color: Black + White Material: Silicon + Plastic Keyboard: 61 keys Tone: 128 Rhythm: 128 Demonstration songs: 45 Power Supply: 4 * AAA 1.5V batteries(not included) or DC 5V Power Adapter(Included) Power Adapter: EU Plug Main body size: 22.5 * 8 * 2.5cm/ 8.9 * 3.1 * 1in Keyboard size: 90 * 16.5 * 0.5cm/ 35.4 * 6.5 * 0.2in Product Weight: 0.9kg / 2lb Package Size: 34 * 23.5 * 7.5cm / 13.4 * 9.3 * 3in Package Weight: 1.3kg / 2.9lb Note: The batteries are not included. Package List: 1 * Roll Up Piano 1 * Power Adapter (EU) 1 * User Manual(English)