Are you looking for a professional, yet reasonable piezo ? Are you in search of a sturdy, trustworthy tool that can do multiple jobs at once? , ! Our professional alarm must meet your needs, this piezo is one of the for you. Feature - ColorBlack - Material: ABS, copper - Size: 2.20X2.20X1.00cm/0.86X0.86X0.39in - Sound Level: 80 - Rate Voltage: 12V DC - Operating Voltage: 3 - 24V - Frequency: 3000 + / - 500Hz - The shell is made of high grade engineering plastic, and the built- is more to detect objects. - Microprocessor, responsive and rapid, improve the horn load capacity, can protect the short circuit caused by overload, suitable for a variety of complex environments. - Clear and bright sound, strong penetrating power so that the ear can not ignore the rapid acceptance of warning information. - Fit for computers, printers, copiers, alarms, electronic toys, automotive electronics, telephones, timers and other electronic products as a sound device. - Small and compact size, light in weight, you can carry and use it wherever you go. Package list: 5 x piezo buzzers