Feature Highlights: 1. Dual-Value Set – Each module measures 4.50cm x 1.7cm (approx. 1.77" x 0.67"), ideal for voice‑amplification projects, sound‑activated controls, and microcontroller‑based audio detection. 2. Sturdy & Reliable – Made from quality CCL material with a blue finish, the module is built to last and ensures consistent performance. 3. Adjustable Sensitivity – Features a digital switching output with adjustable sensitivity, letting you fine‑tune audio detection to match your environment. 4. Wide Voltage Compatibility – Works with 3.3V to 5V power supplies, making it easy to integrate with most common microcontroller boards. 5. Quick & Easy Setup – No complicated wiring or tools needed—just connect and start detecting sound in seconds. Product Details: This LM393 microphone sensor module is designed for clear audio detection and voice‑amplification applications. It picks up sound signals (like claps or voice commands) and outputs a digital signal to control your system. Perfect for sound‑activated switches, clap‑on/clap‑off projects, or any setup where audio triggering is needed. Please note: it detects the presence of sound but does not distinguish between different volume levels. Specifications: - Voltage: 3.3V‑5V - Size: 4.50cm x 1.7cm (1.77" x 0.67") - Output: Digital switching signal - Sensitivity: Adjustable - Material: CCL - Color: Blue - Quantity: 4 pieces Package Includes: 4 x LM393 microphone sound module Note: Slight color variations may occur due to lighting and display differences. Size tolerance is within +/- 1‑3cm. Only the items listed above are included; other products are not part of the package.