In different environments, the wireless interference level is different, and the maximum transmission distance will vary. Unobstructed: • Strong Interference: urban landscape, approx. 1.5-4 km • Medium Interference: suburban landscape, approx. 4-10 km • Low Interference: suburb/seaside, approx. 10-20 km Obstructed: • Low Interference and Obstructed by Buildings: approx. 0-0.5 km • Low Interference and Obstructed by Trees: approx. 0.5-3 km