Feature:1. Function: Active buzzer module has internal oscillation source, will alarm as long as being energized.2. High Level Trigger: Active buzzer alarm module with high level trigger and continous sound output.3. High Quality Material: Buzzer module is made of high quality PCB material, wear resistant, lightweight and durable.4. Compact Size: The size of buzzer alarm sound module is approx. 3.3cmx1.3cm/1.30inx0.51in, compact and easy to carry.5. Easy Installation: Designed with holes for fixing with bolt, easy to install, convenient for using, save your time and energy.Specification:Item Type: Active Buzzer ModuleMaterial: PCBPurpose: DIY AlerterOperating voltage: 3.3V-5VFixing method: bolt hole and screw fixingOperating Voltage: 3.3V-5VFixing Method: Bolt hole and screw fixingPCB Size: Approx. 3.3cmx1.3cm/1.30inx0.51in.Package List:5 xActive Buzzer Module