CPI Piezo Buzzer Indicators CUI Devices CPI Piezo Buzzer Indicators are internally driven indicators that come with screw terminals, wire leads, or pin terminals. These buzzer indicators offer a 70dB to 97dB sound pressure level (SPL) range. The CPI series operates at a frequency range of 2.8kHz to 4MHz and in a temperature range of -30°C to +70°C. CUI Devices CPI Piezo Buzzer Indicators incorporate a driving circuit that eases implementation during the development. These indicators are ideal for consumer electronics, medical devices, household electronics, and industrial applications.