Features: The LM2904 Analog Decibel Detection Module delivers high sensitivity noise monitoring with professional LM2904 chip for precise sound intensity analysis and real time environmental noise control. Featuring 0-2.3V analog output, double LED indicators, this sensory ensures stable transmission and easy integration into electronics or industrial setups. Designed for electronics engineers, enthusiasts, and environmental researcher requiring measurement tools for projects involving sound activated Optimized for closed space applications like smart home automation, sound equipment calibration, and workplace safety monitoring, detecting human voices within 10 meters with accuracy. Engineered with low noise operational amplifier, this module outperforms standard sound detectors Specifications: Component:Plastic Size: Aprpox.41x24mm/1.61x0.94inch Supply: 5V Package Includes: 1 Set Detection Module 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.