it is a lightning protectionwith video balun. Video transmission via UTP CAT5 cable. Over 10-20% wire costs saved. Full-motion CCTV video at distances up to 2000ft B/ W( 600m) , 1500ft Color ( 400m) Building video filter and loop termination circuit ' HUM-BARs' rejective video BALUN transceiver Outstanding interference rejection and transient protection. Building in lightning protection glass/ ceramic gas tuber ( Engineer/ Enhance Model: UST102BP UST102EP) . Male BNC with 150mm minil cable allows connection directly to the camera or DVR. ( UST102BP UST102EP) Male RCA with 150mm mini cable allows connection directly to the DVR/ Media Player. ( UST102RP) No power required. Up to 3, 000ft ( 1km) with active receiver or hub. For more information, please contact with authorized distributors.