This is a portable and multifunctional roll up electronic piano for children and adults. It helps develop you interest in music and cultivate imagination. Foldable and portable, with dual power supply methods, it's suitable for playing both at home or in outdoor activities. Features: Silicone Roll Up Electronic Piano: 49 or 61 keys for your option. Built-in high fidelity stereo speaker provides excellent sound quality. It helps develop kids' interests in playing piano. Multifunction Keyboard: With 16 kinds of tone, 6 preset demos, supports recording/ sustain function, supports play/ stop/ volume adjustment. Silent Playing & Wide Compatibility: Headphone jack allows you to play piano silently without disturbing others. It can be connected to external speaker, tablet, etc. to realize musical creation. Dual Power Supply Methods: Powered by 3 AAA batteries (not included) or external USB cable, suitable for both home and outdoor activities such as camping, picnic, etc. Foldable & Portable: It's soft and flexible, and can be rolled up when not in use, which is space-saving, lightweight and portable to carry in backpack. Note: 1. Please keep it unfolded and flat when using it. 2. Color and size may be slightly different due to manual measurement and different light conditions. Thanks for understanding. Specifications: Keys: 49/ 61 (Optional) Color: Black & White Material: Silicone Tone: 16 Kinds Demo: 6 Songs Volume Control: Yes Recording Function: Yes Sustain Function: Yes Power Supply: 3 * 1.5V AAA Battery (Not included) or External USB Cable Auto Shutdown: about 3min Package Size: 28 * 18 * 7.5cm / 11.02 * 7.09 * 2.95in Package Weight: 49 Keys: 880g / 1.94lbs 61 Keys: 1100g / 2.43lbs Package List: 1 * Hand Roll Piano 1 * USB Cable