Specification: Environmental condition: 1. Working temperature: -5deg C - +40degC 2. Environmental temperature: -25degC - +55degC 3. Relative humidity: 85%((when the temperature is below 30degC)) 4. Atmosphere pressure: 70 Kpa~106Kpa 5. Storage temperature: -25degC - +55degCPhoto electricity Performance: 1. Insertion loss:<0.3dB 2. Return loss: PC< 40 dB, UPC<50dB, APC< 60dB 3. Insulating resistance between the box and the earthing device: 1000MΩ /500VDC 4. Voltage- resistance between the box and the earthing device: Under the effect of 3kv/DC/1min, non-puncture, and no arc-over.