| Main centres: | 1-3 business days |
| Regional areas: | 3-4 business days |
| Remote areas: | 3-5 business days |
An active buzzer has a built-in oscillator, so it can produce sound with only a DC power supply. It generates sound independently by turning it on or off. The frequency of the sound is fixed and cannot be adjusted. Active buzzers are typically available in voltages from 3V to 24V.