Top-quality Trailer Cable insulated and PVC jacketed ensures flexibility at -40° C. The conductors are stranded copper, color coded to meet SAE specs, resist oil, grease and weather. - 100% copper conductor. Surge Guard Portable Model With LCD Display Automatically shuts off the power when excessive voltage, Low -102V and High +132V, or open neutral is present Automatic reset on power restoration LCD display will continuously monitor and display (in English) voltage and amp draw on all legs (30 Amp one leg and 50 Amp legs one and two) Weather resistant We get our cable made by East Penn (Deka)