The 12V 2.58A 36W AC Power Supply Cord Adapter Cable Charger for Microsoft Surface Pro 3 Pro 4 (i5 i7) is a high-quality and certified power adapter. It features temperature protection, current and voltage surge protection, anti-jamming filter, safe transformer units, EMC filter, and meets national 3C standards. It is suitable for use with the Microsoft Surface Pro 3 and Pro 4 (i5 i7) laptops.