Features: Feature SW420 vibrating sensory modules with metal construction, detecting low frequency vibrations through digital switcher output for precise motion sensing in security and automation applications. Operates efficiently at 3.3V to 5V, making it suitable for various microcontrollers like integration into electronics and industrial systems. Each module with a sturdy metal housing, ensuring space saving installation and long lasting in harsh environments. Automatically output upon vibrating detection and stable conditions, enabling real time monitoring for security alarms or equipment malfunctions. Ideal for home security, industrial automation, and anti theft systems due to its vibrating sensing and easy microcontroller connectivity. Specifications: Component:Metal Size:Approx.3.2x1.4cm/1.26x0.55inch Package Includes: 5Pcs SW420 Normally Closed vibrating sensory note: 1.Please allow 1-2cm errors due to manual measurement, making sure that you not mind before order. 2.Due to the differences between different monitors, the picture may not reflect the actual of the item.