YF-8812 Pole Light Mini for Hapison Lithium battery BR311 1 piece used.With batteries that can be used immediately.The world's smallest and lightest rod light.The high-brightness LED makes it easy to see even if you are sick.[Battery life] Continuous about 15 hours.[Light source] High-brightness LED (red, green).[Mountable range] Approx. ?1.4 mm to 3.2 mm[Accessories] Tube cover