Hey DIY electronics folks! These Hall effect sensors are super handy little modules that detect magnetic fields - perfect for all kinds of projects. Each pack comes with 5 sensors that work between 3.3-5V, making them compatible with Arduino, Raspberry Pi, and most microcontrollers. The 3144E switch type gives you stable performance with high sensitivity and fast response time. Here's how it works: when a magnet comes near, the digital output goes low and the red signal light turns on. No magnet? Output stays high and light stays off. You get both digital and analog outputs too, so you can choose what works best for your project. The mounting holes make installation a breeze, and the small size means they fit anywhere. Perfect for measuring motor speed, counting rotations, detecting position changes, or any project where you need to sense movement or presence without physical contact. The temperature performance is solid, and they're surprisingly accurate for the price. Wiring is straightforward - just connect VCC to power positive, GND to negative, and use either the DO (digital output) or AO (analog output) pins. Whether you're building a RPM counter, security system, or automated project, these sensors deliver reliable magnetic detection that just works!