Reference Talk Distance:
5 watts / 4 watts of launch power: 1-3 km in urban areas, 3-5 km in open space .
3 watts / 2 watts of transmitting power: 500 m – 2 km in urban areas, 1-3 km in open space .
1 Watt / 0.5 watt transmission power: urban area 200 meters – 800 meters
in urban areas, 500 meters – 1.5 kilometers
in open space .