UltraFire’s 16340 flashlights prioritize ​​pocket-sized portability​​ (e.g., 54.5mm length, 51g weight) while maintaining ​​IPX8 waterproofing​​ for submersion up to 2 meters. Features like ​​magnetic tail caps​​ and ​​rotatable belt clips​​ enable hands-free use during repairs or outdoor activities. The ​​UltraFire LED​​ delivers ​​600–1200 lumens​​ with adjustable focus, balancing flood and throw for tasks like hiking or emergency signaling.