The FED-301PK Audio Level Indicator Kit is a versatile and practical tool for monitoring audio levels in various applications. It operates on a wide voltage range of DC 5V or DC 8–24V with a working current of less than 75mA. The kit features a USB or 3.5mm audio input interface and automatically switches between wired and wireless inputs. Key Features: LED Display: Includes 40 high-brightness 5mm LEDs with red and green colors for clear visualization of audio levels. Sensitivity Adjustment: Equipped with a potentiometer for fine-tuning sensitivity. Flash Modes: Supports single-channel and dual-channel status display with peak hold functionality. Compact Design: Kit dimensions are 18.67 × 3.53 cm², making it easy to integrate into projects. User-Friendly Packaging: Comes in a self-sealed bag with PDF assembly instructions. Additional Information: Weight: 76 grams. Application: Ideal for audio signal monitoring in educational, experimental, or DIY projects. This kit provides a visual and interactive way to understand audio signal dynamics and is a great addition for electronics enthusiasts.