This is a round buzzer that operates around the audible 2kHz range. You can drive it directly from a 5V PIC or arduino to generate the tones.

Resonant Frequency: 2300 +/- 300 HZ

Rated Voltage: 5V

Voltage range: 4 : 8 V

Rated Current: 30 ma

Min Sound output at 10 cm: 85 dB