I want to know what are

- Frequency Response
- Impedance
- Sensitivity

Candidate Number One

- Frequency Response: 30~15,000Hz
- 2.2k Ohms
- Sensitivity: -52dB 5dB (at 1kHz, 0.28V)

- 50-13000Hz
- 600 Ohms
- -58dB ± 4dB at 1KHz

Candidate Number Three

- 80-12000Hz
- 600 ohms
- -58dB ± 4dB at 1KHz

Candidate Number Four

- 20-2000Hz
- 600 ohms
- -58dB ± 4dB at 1KHz

I also want to know what does these signs means

- Φ I found it in Plug section of microphone's specifications (Φ3.5mm stereo plug)
- ±

Thank you.