The 4X20Q88539 Lenovo 135W Slim AC Adapter for ThinkPad Extreme 20MG is a compact and lightweight power adapter designed specifically for the Lenovo ThinkPad Extreme 20MG laptop. With its 135 watt power output, it provides quick and efficient charging for your device. The slim design makes it easy to carry and store, perfect for travellers or on-the-go professionals. The adapter also features advanced safety features to protect your device from overcharging and overheating. Overall, the 4X20Q88539 Lenovo 135W Slim AC Adapter is a convenient and reliable power adapter for ThinkPad Extreme 20MG users.