... environment, immune to temperature,humidity, noise, air, dust, light…3.RF interference ability, 4. Transmission power only 0.2 mW ... in thebathroom.The built-in microwave sensor switch can penetrate plastic, glass, wood . So it can be installedin glass or plastic shell ... <0.9WDetection angle: 360°Luminous flux:850lmInstallation height: 2.5-3.5m (ceiling mount)Weight: about 1.142 kgLamp partLED quantity ...