Skyvast 90W 20V 4.5A Square Tip AC Adapter Charger for Lenovo ThinkPad X1 Carbon 344428U N3N25UK 34442HU L440 Ultrabook, Lenovo IdeaPad Z510 S210, Lenovo Essential G700 G710 G405 Input: 100~240V~1.5A 50/60Hz. Output: 20V~4.5A~90W (45W 65W Compatible). Connector: Yellow USB Square Tip. Replacement for Lenovo ThinkPad X1 Carbon T440 E431, IdeaPad Z510 Notebook PC, Essential G700 Notebook Worry-free 18-month warranty and friendly customer service.