100 magnetic reed switch sensors in a single DIY kit for versatile electronics projects. Key features and benefits - Compact and easy to integrate: Each reed switch size is 3 11mm, helping you fit sensing into tight spaces. - Normally open NO contact: Suitable for circuits that detect magnet presence as a switch closure. - Ready for multiple projects: A 100-piece quantity provides ample supply for prototyping, testing, and expansion. - Clear sensing function: Uses a magnetic field to actuate a reliable dry contact, enabling simple wiring to microcontrollers, PCBs, or other control circuits. - Ideal for DIY electronics enthusiasts: Great for learning, experimentation, and building custom sensing solutions without frequent reorders. What you can do with this kit - Door or window sensing: Create simple security or access-control sensors by detecting magnet position to trigger a microcontroller input. - End-of-travel or limit sensing: Implement basic position or travel detection in small mechanical assemblies, robotics, or projects with moving parts. - Prototyping and testing: Use the 100 switches to quickly prototype multiple sensing ideas, test logic conditions, and build reliable, repeatable circuits. Compatibility and usage notes - Function: Normally open reed switches respond to a magnetic field to close a circuit. - With standard electronics: Suitable for wiring to microcontrollers, logic circuits, and PCB layouts common in DIY projects. - Size and form factor: Compact switches sized 3 11mm, designed for easy mounting in compact enclosures and assemblies. - Performance: Provides dependable magnetic actuation for a wide range of low-power sensing applications. This kit offers a practical, ready-to-use supply of reed switches for hobbyists and makers who need reliable NO magnetic sensing components for multiple projects.