Based on this product's specifications, here are some alternatives and similar models
Buzzer unit PATLITE LR6-BU
Summary description:
The PATLITE LR6-BU is a reliable buzzer unit designed for various applications. It operates on a DC power source with an output voltage of 24 V. With a diameter of 6 cm, it is compact yet powerful. The unit functions effectively in a wide temperature range of -20 to 50 °C and can withstand humidity levels from 0 to 90%. This makes it suitable for diverse environments, ensuring consistent performance.