A. It is easy to use, featuring 3 built - in modes (static single - color mode, gradient multi - color mode, jumping multi - color mode) and 49 effect modes, along with a variety of color combinations. You can quickly switch mode selections with just one button. B. It uses high - brightness lamp beads and optical fibers. The colors are relatively vivid, and the optical fibers are waterproof. Battery type: 3 AAA batteries or 18650 lithium batteries (batteries are not included). C. It is equipped with 130 ultra - soft optical fibers (0.75 - millimeter end - emitting polymethyl methacrylate optical fibers), which can be cut into different lengths (maximum length 1.65 meters), and the full - spectrum color effect is quite amazing. D. It can meet the needs of various music scenes and is suitable for occasions such as dance, parties, light shows, and EDM music festivals (a carrying bag is included).