?Kids Piano Size?Product size: 40 * 15 * 4 cm / 16 * 5.9 * 1.6 inch (L * W * H)! Perfect for ages 3 years and older. ?Two Power Supply Methods?Powered by three 1.5V “AA” batteries (not included). Or use a USB power cord to connect to the USB jack on the back of the keyboard to power! This product is NOT including power adaptor and USB wire.