Cctv4Less 3GHz F81 Barrel Female to Female Coupler Connector F Type Coaxial Cable Extension (10 20 30 50 100 Pack) (50) 50 auspowers_batchfive according to the material of B0DCFNSWJH according to the material of the measured object to make the measurement result more accurate 8MHz Effective Distance 6~8M 6~8M 6~8M 6~8M Power Supply 2×AAA batteries (not included) 2×AAA batteries (not included) 2×AAA batteries (not included) 2×AAA batteries (not included) Package portable bag portable bag portable bag portable bag Key Features Sharing Port Sharing Port Sharing Port Sharing Port Accessories 3 and Off Air Antenna systems and extending the connection of a cable box