Heavy Duty Flexible Rubber Jacket, Top quality and made by environment-friendly material, Polyethylene insulation improves high frequency response. Heavy Duty Gold-plated connectors resist corrosion, provide durability and improve the signal transmission, ensures minimal signal loss. XLR Connector with internal strain relief for rugged reliability, 20 AWG 4N Oxygen-Free Copper (OFC) conductor for enhanced signal clarity. The XLR connectors are color-coded Black(Left Channel) and Red(Right Channel), It splits closer to the XLR ends, the distance to the split point is about 19.6 inches(50 cm). The 3.5mm plug is a standard 3 pole (2 rings and a tip) connector, This won't work on a Smartphone that has a 4 Pole TRRS port. You may need a TRS to TRRS adapter. Please make sure the power for all your equipment is "OFF" when changing connections. These 1/8 to XLR Cables are Designed to Split a 3.5mm Aux Balanced / Stereo output Signal into two Unbalanced / Mono XLR input Signals (Left and Right Channels), They are ideal for connecting your Smartphone/ PC / Laptop to a Mixer/Speakers or similar device.