🔔 Passive Buzzer Unit – Compact Audio Alert Module The Passive Buzzer Unit is a small‑sized buzzer module designed to deliver clear and audible sound output when driven by an external signal. Operating at a 4 kHz oscillation frequency, it can emit sound up to 72 dB (measured at 10 cm), making it suitable for a wide range of alarm and notification applications. Unlike active buzzers, this unit functions as a passive component, requiring a 4 kHz 1/2 duty square wave drive signal to produce sound. Its protective housing ensures durability, while the compact design allows easy integration into embedded systems and space‑constrained projects. With low power consumption, it is ideal for energy‑efficient devices. ⚙️Features ✅ Drive signal: 4 kHz oscillation frequency ✅ Sound output: Up to 72 dB (within 10 cm, at rated power) ✅ Drive mode: 4 kHz 1/2 duty square wave ✅ Compact and durable housing ✅ Low power consumption for efficient operation 📦 Package Contents 1 × Passive Buzzer Unit 1 × HY2.0‑4P Cable (20 cm) 🔧 Applications 🚨 Alarm systems 🔔 Reminder/notification devices ⚙️ Warning indicators 📲 Audible feedback mechanisms 🏠 Smart home and DIY projects 📊 Technical Specifications Specification Parameters Drive Frequency 4 kHz 1/2 duty square wave Power Consumption 5 V @ 86 mA Net Weight 3.5 g Gross Weight 8.5 g Product Size 24 × 24 × 8 mm Package Size 93 × 138 mm 🌍 Why Choose Passive Buzzer Unit? Provides clear and reliable audio alerts Compact and lightweight for easy integration Durable housing protects internal components Ideal for low‑power, embedded, and portable systems
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