Features: Experience precise sound monitoring with the LM3915 sound level indicator DIY set, featuring a 10 segment LED display that provide a clear visual representation of sound intensity. This set is designing for easy assembly and offers accurate sound level indication, for various sound devices and supporting dc9v-12v power input. For electronics enthusiasts, DIYer sound equipment creators, educators, and anyone interested in sound technology. Perfect for home sound system tuning, DIYer sound projects, classroom demonstrations, and troubleshooting sound equipment issue. Crafted from durability PC and metal materials, this sound spectrum analyzers ensures long lasting performances and reliability in diverse applications. Specifications: Component:ABS Size:Approx.62x27mm/2.44x1.06inch Package Includes: 1 Set Sound Level Indicator note: 1.Please allow 1-2cm errors due to manual measurement, make sure that you donot mind befores you order. 2.Due to the differences between different monitors, the picture may not reflect the actual coloring of the item. Thanks for your understandings.