This product is bright, light, small, and comes in casual colors with a simple shape and easy-to-use design. It can be attached (tagged) to everyday items and even makes a thoughtful gift. Battery replacement is also very easy. Perfect for dog walking, children's commutes, outdoor activities like camping, and essential during emergencies! "In case of an emergency, let Tag Light illuminate your path, and save your smartphone battery. The LED uses a white LED from Nichia Corporation, a Japanese manufacturer, allowing you to move around even in the dark. The lithium-ion battery provides approximately 15 hours of continuous illumination. It can be switched to constant-on by sliding, and also designed to light up only when pressed to conserve battery life. Furthermore, we paid close attention to the shape and feel of the switch area to ensure it's easy to operate, even though it's small. I took it out and tried the light. Retail price: 1760 yen"