Top Safety Standard: This item has passed strict safety tests, meaning its components and quality meet the national gold standard for electricity product safety Fit for Lenovo Thinkpad Thunderbolt 3 4 Essential Smart Dock Gen 1 2, Ultra Pro Docking Station Power Supply Adapter Cord. [It won't charge your device if it needs power over 135W] Max Output Power: 135W 20V 6.75A,Connector Type: Square Connection Point Package - 1 x power adapter, 1 x AC Power Cord 12-month manufacturer warranty