The GZL from Shanghai Huaxiang Computer Communication Engineering is a DC Block with Frequency 100 MHz to 18 GHz, Insertion Loss 0.2 to 0.8 dB, Breakdown Voltage 100 V (DC Voltage), VSWR 1.15:1, 1.40:1, Operating Temperature -55 to 100 Degree C. Tags: Connectorized. More details for GZL can be seen below.