Magnetic & Piezo Micro Buzzers CUI Devices Magnetic and Piezo Micro Buzzers are housed in compact, surface-mount packages as small as 3.2mm x 3.2mm. The buzzers feature a profile as low as 1.9mm and are reflow solder compatible. These magnetic and piezo transducer micro buzzers are externally driven and offer 65dB to 105dB sound pressure levels at 10cm. CUI Devices Magnetic and Piezo Micro Buzzers are ideal for a range of portable equipment applications.