Rock out, then roll it up! Triple Award winning, flexible, completely portable piano by MukikiM with 49 standard keys. Features : ♫Multiple Keyboard Tones ♫Multiple Demo Songs ♫Echo/Sustain ♫Record & Playback ♫Built In Speaker w/auxiliary capabilities(headphones or external speaker) ♫Powered by USB (cord included!) OR batteries ♫Completely portable - take it with you and play ANYWHERE! ♫Power saving mode activates when not in use ♫Realistic Sounds Specifications: ♫Keyboard Size (open): 27.75"x5"x.25" ♫Control Panel Size: 3.25"x6"x1" ♫Rolls up into a box sized: 6.25"x8.5"x3.25" ♫Materials: Silicone, plastic ♫Batteries: 4x AAA (not included) Package Includes: ♫1-Piano with attached control panel/speaker ♫1-41" USB power cord (wall plug not included) ♫1-User Manual Notes for usage: ♫Due to the soft silicone that the keyboard is made of, there are times when compound sounds are produced due to cross-feedback or vibrations registering on adjacent keys. This is normal for such devices and is not indicate a faulty or malfunctioning product.