The C180PB is a thermally-compensated, DC biased, piezo buzzer manufactured by CTS Corporation. It is a low-profile, piezo-electric buzzer with a nominal operating voltage of 5 VDC and operating temperature range of -20°C to +70°C. The C180PB incorporates a thermally-compensated circuit, which prevents the oscillation frequency from changing due to temperature variations. It also has a built-in DC bias circuit, which can be used to adjust the sound frequency and volume, allowing for a wide range of sound frequencies and volume levels to be achieved. The C180PB is available in two sizes and a variety of colors. It is typically used in a variety of applications, including medical, industrial, communications, and security systems.