Feature: 1. [Premium Material] Hand roll up piano with standard 49 keys (A1 to C9), using premium silicone keyboard, safe and harmless, suitable for all ages. 2. [Multi Functional] This roll up piano has 16 tones, 6 demonstration songs, easy recording, editing, playing, sustain, vibrato, teaching, and chord functions. 3. [Compatible Devices] Independent playing with its own speakers, supports external speaker or headphones, multi platform access to devices, arranging and mixing. 4. [Easy To Use] This keyboard piano can be powered by external USB or plugged into 3 AAA batteries (not included). Support MIDI output, connect with computer or tablet. 5. [4D Surround Sound] Portable and smart foldable keyboard piano with 4D surround sound effect and heavy bass touching the heart. Suitable for travel, outdoor, home, school. Specification: Item Type: Roll Up Piano Material: Natural Silicone, ABS Color: Black Output Power: 500mW Connected Devices: Support External Speaker, Headphones, Tablet Power Supply: USB Power Supply, 3 x AAA Batteries (Not Included) Power Supply Product Features: Record, Play, Start, Stop. Package List: 1 x Roll Up Piano1 x Power Cord1 x Manual Note: You need to lay it flat when practicing the piano.