twdyc 37 keys flexible roll up piano portable silicone soft keyboard piano w/o battery flexible hand rolled musical instrument twdyc made of silicone, soft and comfortable surface, high sensitivity.<br/>8 different sounds to choose from. 8 tones: acoustic grand piano, orchestral harp, church organ, tubular clock, electric guitar (jazz), violin, string ensemble 1 and acoustic guitar (steel)<br/>6 demo songs provide learning fun while your child learns how to play.<br/>covers the need for children and students to learn how to play the piano and improve their musical skills.<br/>recording and playback makes learning more fun.<br/>easy to install and carry.<br/>the main material: silicone<br/>control box size: 180x150x22mm/7.09*5.91*0.87"<br/>keyboard size: 7200x125x90mm/283.46*4.92*3.54"<br/>product net weight: 450g<br/>keyboard: 37 standard keys<br/>tone: 8 tones<br/>demo music: 6 demo songs<br/>volume: knob volume control in clockwise/counterclockwise<br/>functions: record and play function, stop function, echo maintenance function<br/>power saving mode: smart sleep after 3 minutes with no action<br/>built-in speaker: support for external speakers and headphones<br/>internal power supply: 4 aaa batteries (not included)<br/>external power supply: usb power adapter and usb power cord<br/>notes: <br/>1. there may be slight size deviations due to manual measurement, different measuring methods and tools.<br/>2. the picture may not show the actual color of the item because of different photographing light, angle and display monitor.<br/>packages: <br/>1 x roll up piano without battery<br/>1 x usb power cable<br/>due to the difference between different monitors, the picture may not reflect the actual color of the item.