Upgrade your DIY and industrial projects with our 4-pack ir break beam sensor set, featuring high-precision photoelectric switch and photoelectric beam sensor technology with a 0.8–11.8 inch detection range.Each ir break beam sensor works by emitting an invisible infrared beam; when an object blocks the path, the photoelectric switch triggers an instant signal change. With a detection range of 0.8 to 11.8 inches, this photoelectric beam sensor delivers consistent, accurate performance for counting, obstacle avoidance, and automation tasks.Built with a durable plastic casing and metal pins, this break beam sensor supports 5V DC input and includes indicator LEDs for easy setup and troubleshooting. The compact, pre-wired design of this ir sensor fits into tight spaces, making it perfect for DIY electronics, robotics, smart home systems, and industrial control panels.The 4-pack set gives you enough photoelectric sensor units for multiple projects or replacements. Unlike mechanical switches, these infrared sensors use non-contact detection, eliminating wear and tear for long-lasting, reliable operation. Whether you're a hobbyist or engineer, this set is the ideal solution for all your light detection and automation needs.