Item Type: 61 Keys Hand Roll Piano Material: Natural Silicone, ABS Color: Black Output Power: 500mW Connected Devices: Support External Sound, 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 61 Keys Hand Roll Piano 1 x Power Cord 1 x Instruction Manual You need to lay flat when practicing the piano 161 KEYS STANDARD PIANO: 61 keys hand roll piano for all ages with 61 keys (A1C9) standard piano, 16 tones, 6 demo songs. 2SMART PIANO: Hand roll piano is easy to record, edit, play, sustain, vibrato, teach, and chord functions. The smart piano that you can take with you. 3WITH SPEAKERS: Portable roll up piano comes with its own speaker for independent playing and supports MIDI output for use with a computer or tablet. 4CONNECTED DEVICES: Roll up keyboard piano supports external sound or headphones, multi platform access to devices, and arranging and mixing. 54D STEREO SURROUND SOUND: Electric roll up piano can be powered by external USB or plugged into 3 x AAA batteries, with 4D stereo surround sound and heavy bass.