Mikroe BUZZ 3 Click features a sounder driver that produces higher volume with a lower current. The BUZZ 3 features the Diodes Incorporated PAM8904 piezo-sounder driver with an integrated Multi-Mode charge pump boost converter. The PAM8904 can drive a sounder load of up to 15nF with its wide input signal range of 20Hz to 300kHz. It provides a 9V output, enables the selection of three different piezo sound pressure levels, and keeps current consumption low. It also extends battery life by employing built-in automatic shutdown and wake-up functions.