S88 Portable 88 Keys Roll Up Soft Flexible Electronic Music Keyboard Piano Built-in Loud Speaker Recharge Battery for Children Beginner STANDARD PARAMETERS,COMPACT FASHION---88-key digital piano;This piano has 129 excellent tones and equipped with 100 rhythms and 80 demos. Keyboard length is 50 inches, compared to the real piano 1: 1 ratio design. IT IS CONVENIENT TO CARRY IT WITH YOU,ANYTIME,ANYWHERE TO PLAY THE PIANO---Small is not an Area,you can take which you whatever you go and practice any time;Built in 1100mA Lithium battery,rechargeable battery. MULTIPLE INTERFACE FUNCTIONS,LET YOU FREE TO ENJOY IT---MIDI outputCan be connected with computer to edit the music you make. Also can be used as power bank in case of emergency.MP3 player;Multifunctional support Sustain and Recording;Rich interface;SD cardUSBexternal speaker, headphoneexternal power source, sustain pedal. PROFESSIONAL DESIGN FOR CHILDREN AND BEGINNERS---Portable piano,The piano uses the newest 24 bit microprocessors, which endow it more powerful function and more mellow and standard tone in contrast with the traditional 8 bit microprocessors,black keys higher than the white,Upgarding keyboard thickening with perfect feeling;with the muti-functional LED digital display tube, features simple operation. THE HIGHEST TECHNICAL QUALITY,UNLIKE THE CHEAP INFERIOR PRODUCT---High cost-effectiveness and easy portability.We use green harmless top food-gradesilicone keyboard,more healthy environment.This product has made the FCC product quality certification.