Active means the oscillator is built in: pin high, it sounds; pin low, it stops. For melodies you want the passive kind, but for alarms and confirmation beeps this is one line of code.
Specifications
| Type | Active (self-oscillating) |
| Rated voltage | 5 V DC |
| Frequency | 2300 +/-300 Hz |
| Sound output | 85 dB at 10 cm |
| Diameter | 12 mm |
