10 Pair Mc4 Male Female M F Wire Cable Connector Set Solar Panel LOWER CONTACT RESISTANCE:Resistance of extra high & low temperature and fireproof COMPATIBLE WITH PV cables with different insulation diameters EXCELLENT AGING RESISTANCE AND UV ENDURANCE:It can be used in harsh environment WATERPROOF AND DUSTPROOF:Double seal rings for better waterproof effect,Created seal,design of dust proof. RESISTANCE of extra high & low temperature and fireproof