Optical attenuator is packaged in a solid enclosure of Bulk.Its Panel, Socket qualifies it for most adjustable attenuators.As the RF Attenuator is packed in BNC In-Line Module, international shipping is convenient.Please refer to the RF Attenuator for 2 pins functions.Based on test statistics, the Attenuator's minimal operating temperature would be 0°C.A temperature above 102°C is not suitable for operation of the RF Attenuator.