A solid enclosure of Tape & Reel (TR) surrounds optical attenuator.This RF Attenuator is conveniently packaged in 24-VQFN, making it easy to ship abroad.To find out what the functions of 24 pins are, please refer to their RF Attenuator.Based on test statistics, the Attenuator's minimal operating temperature would be -40°C.Temperatures higher than 85°C are not recommended for operation of the RF Attenuator.