Portable Electric 88 Keys Roll Up Piano Multifunction Digital Piano Keyboard Built-in Speaker Rechargeable Lithium Battery Reverberation BT Function Flexible Silicone Piano Keyboard Features: Adopting environmental conservation silicone, non-toxic and harmless, soft and waterproof; Flexible roll-up design and portable size,  makes it easy to play the piano anytime and anywhere you want. This piano has 128 excellent tones and is equipped with 128 rhythms, 15 demos and 64 chords, can record and playbadk, features echo, trill and continuation chord, suit for learner and lover. Standard piano keyboard with 88 keys, also the black key is higher than the white key, make you feel like playing real piano. With dual mafnetic stereo speaker, can also be externally connected with audio system, earphone and home theatre; with LED digital display, can indicate the battery capacity, sound volume and function selection,easy to operate; built-in rechargeable lithium battery with 1200mAh capacity, can be used for a long time after being fully charged.   Support connection to microphone by BT function; support MIDI function, can connect to computer to edit music and play piano games. (details refer er manual) External KTV reverb microphone, enjoy the fun of playing piano while singing; pacakge comes with a sustain pedal, press the button to turn on the sustain function. Specifications: Model: IP88S Material: silicone, ABS Key Quantity: 88keys Interface Support: microphone jack/ 3.5mm audio input/ 3.5mm audio output/ sustain pedal port/ DC 5V charging port Power supply: 1200mAh lithium battery Black key size: 7.9 * 1.2cm / 3.11 * 0.47in White key size: 13 * 2cm / 5.12 * 0.79in Keyboard size: 125 * 15.8cm / 49.21 * 6.22in Control Box Size: 22.6 * 9.8 * 3cm / 8.9 * 3.86 * 1.18in Item weight:  1320g / 46.56oz Package size: 27.5 * 23 * 10cm / 10.83 * 9.1 * 3.94in Package weight: 1752g / 61.8oz Package List: 1 * roll up piano 1 * USB cable 1 * sustain pedal 1 * user manual