CJ20MM Metal Frame/Mylar
- Dia: 20 mm, height: 3.6 mm
- Output: nom .1 watt and max .2 watt
- Frequency range: 760-6000 Hz
- Net weight: 4.5 g
CJ28MM Metal Frame/Mylar
- Dia: 28 mm, height: 4.6 mm
- Output: nom .4 watt and max .7 watt
- Frequency range: 650-12,000 Hz
- Net weight: 40 g