Thank you for viewing. I also use this myself, and it significantly reduces running costs, even for use as a tip light. It's a smaller LED light than the Miralight. It uses a CR311 battery. CR311 batteries are available for an additional 100 yen each. The light itself is also available for an additional 150 yen. Please comment with your desired color. The battery life is shorter than the Miralight due to its size, but it's economical because the battery is replaceable. One battery for testing the light is included.