【L5-30P to L14-30R 】NEMA L5-30P locking plug end connects to 3 prong generator outlet, NEMA L14-30R receptacle end connects to 4 prong power transfer switch inlet.【Superior Durability】UL Compliant STW 10/4 AWG Configuration. Higher conductivity pure copper wiring coated with a heavy duty flame retardant, UV resistant, durable and weatherproof PVC jacket insulation that serves as protection from outdoor elements, wear and tear.【LED Power Indicator】There is a Power Indicator on the 3 prong to 4 prong adapter. It can notify the user visually when the cord is connected to the power source, which provides the best performance and higher security especially working at night or in dark areas.L5-30P male plug with threaded can be fastened securely into generator,prevents cord from falling off.【Twisted Lock Design】L5-30P male plug with threaded can be fastened securely into generator.The strain relief structure makes the adapter cord not easy to pull out that avoid abrupt power disconnection.【Please Pay attention】There are various models of this product, please check carefully to avoid wrong purchase.If you have any questions, please do not hesitate to contact me. TOOLIM will provide you with satisfactory pre-sale and after-sale service.