I'm selling this item because it's larger than I expected and I won't be using it. It uses either 4 AA batteries or a USB port (cable not included). Batteries are not included. Turn on the power with the "I" switch on the back. Short press the ○ button on the front to turn it ON/OFF. Long press the ○ button to adjust the brightness. Shipping will cost 850 yen. Please refrain from price negotiations.