A0201-45/A0202C A0201-45 Alnico RoundDia: 57 mm, Height: 20 mmOutput: nom .2 watt and max .4 wattFrequency range: 370 – 4500 HzNet weight: 41 g A0202C Alnico RoundDia: 66 mm, Height: 21.5 mmOutput: nom .5 watt and max 1 wattFrequency range: 320-5000 HzNet weight: 41.8 g