Olympia 28000mAh Laptop Portable Charger External Battery Pack Multi-Voltage (5V 12V 16V 19V) Power Bank with US/UK/EU Plug for iPad Air, Mini, iPhones, Samsung Galaxy, Netbooks, Notebooks and Laptops 28000mAh of capacity, provides a full charge to most laptops or approximately 13 cycles to most smartphones. Various connectors cover major types of laptops and cell phones on the market, DC and USB outputs for charging a laptop and 5V USB-charged devices simultaneously, adjustable 4 voltage levels (9V/12V/16V/19V) suiting your needs for different laptop models Stylish and slim aluminum-body ensures good heat dissipation,the smart digital display window makes it easy to regulate voltage and know how much source you've got left. It will automatically shutdown when short circuit or overload output happen to protect your devices. Package contents: 1 Olympia 28000mAh External Battery Pack, 10 phone connectors, 10 laptop connectors, 1 USB cable, 1 DC power cable, 1 AC 100-240V power adapter, 1 user manual, 1 of each EU/UK/US adapter. 30 Days Satisfaction Guaranteed. 12 Months Replacement Warranty. Please note that some new HP and Dell laptops have a computer chip that tells the laptop not to accept charge from unknown power source. This is to protect the laptop not to be damaged by unfitting adapters. Please check your laptop AC adapter connector diameter and refer to description size chart.