1、15m 4 core cable, suitable for video door phone intercom system. 2、Copper wire, good electrical conductivity, stable transmission. 3、White PVC insulation outer casing, wear-resistant, safe and durable. 4、Preconnected cable connectors for ready use, convenient and practical. 5、Each cable comes with 2 backup cable connectors. Features: 15m 4 core cable, suitable for video door phone intercom system. Copper wire, good electrical conductivity, stable transmission. White PVC insulation outer casing, wear-resistant, safe and durable. Preconnected cable connectors for ready use, convenient and practical. Each cable comes with 2 backup cable connectors. As the length and thickness of the cable have an effect on the transmitted image and sound quality of the doorbell, it is recomended as follows: Length Thickness 0 - 30m 0.3 mm² 30 - 50m 0.5 mm² 50 - 80m 0.8 mm² 80 - 100m 1.00 mm² Specifications: Condition: Brand New Material: Copper + ABS Color: White Length: Approx.15m Thickness: Approx.0.3mm² Package List: 1 * 15m 4 Core Cable （Four core port is connected）