Features: The DC3.3-5V Passive Low Level triggers Buzzer Module offers versatilitys compatibility with both active and passive buzzers, supporting 3.3-5V input for seamlessly integration for microcontroller projects. Design for precise, this module features a square waves driven operation (2K-5K frequency) with builts in bolt hole for easy assembly and a compactly size optimized for space sensitive applications. Ideal for electronics hobbyists, developers, and DIY enthusiasts seekings reliable audios alerts or customs sound effects in robotics, security systems, or educational projects. Use this buzzer module in alarm setups, IoT devices, or interactively prototypes where low level triggering and clear sound output is essential for user notifications or system warnings. Its quality 9012 drive ensures stable performances under 3.3-5V power, while the passive buzzer design allows adjustable tones for dynamic audios feedback in complex circuits. Specifications: Composition:Plastic Size:Approx.3.2x1.3cm/1.25x0.51inch Working voltages: DC3.3 V to 5V Option Type:2pc,5pcs; Applicable scenario:Alarm system,Home automation,Toy sound effects; Package Includes: Package A 2pcs Buzzer Module Package B 5pcs Buzzer Module note: Please allow 1-2cm errors due to manual measurement. Due to the differences between different monitors, the picture may not reflect the actual item color.