BATTERY POWER SUPPLY Powered by 4 "1.5V" AA batteries (not included). UNIQUE DESIGN It is made of high-quality ABS material, with fine workmanship and smooth edge design. The piano keys are specially designed for the little fingers, allowing children to better practice playing the piano. Easy to carry, children can play indoors or outdoors. MULTIFUNCTIONAL 32-KEY PIANO Play piano function + dual speakers + ensemble mode + detachable microphone + keyboard drum + recording and playback function + automatic standby sleep function + 8 tones + 8 rhythms + 22 demos + 4 percussion. You can adjust the speed and volume by yourself.