The GZL-SMA-250 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 50 to 250 V (DC Voltage), VSWR 1.20:1, 1.45:1, Operating Temperature -55 to 100 Degree C. Tags: Connectorized. More details for GZL-SMA-250 can be seen below.