HEINRICH OCM column mount loudspeakers are IP56, and compliance with IEC60849 and EN54 approved are robust, weather-resistant construction, y et are surprisingly stylish each model uses 3. 5''full range speakers crossing over to a horn tweeter, it a perfect choice for wall-mounted applications where aesthetic is of prime importance. The aluminum structure sealed with silicone rubber, gasket, makes the OCM Series water resistant, opening angle (H x V) between 200 to 50 Degree @1Khz as per BS standard