The power bank has 2 output ports to charge laptop.

One is 12V, which also fits 12±2V;
The other is 20V, which also fits 20±2V.

So, check which plug is suitable for your laptop. After you make the power bank connected with your laptop, you need to press the button to turn it on, but no need to press when charging smartphones.

The power bank supports 12V*2.5A=30W（maximum up to 35W） and 20V*3A=60W(maximum up to 80W), and it does work well within these numerals.

Laptop connector/Adapter included in the Package (DC 5.5*2.1mm to below adapter) :
A:6.0/1.4mm FUJITSU/SONY
C:5.5/2.5mm ACER/ASUS/IBM/DELL/HP/COMPAQ/FUJITSU/TOSHIBA/NEC
E:5.5/1.7mm Acer
F:4.8/1.7mm HP
H:5.0/1.0mm Samsung
I:7.4/0.6mm(or 7.4/5.0mm) DELL/HP
K:7.9/0.9mm(or 7.9/5.5mm) IBM/LENOVO
L:3.0/1.1mm Samsung
O:4.5/3.0mm only for HP, can not be used for Dell Laptop
Lenovo: fits for LENOVO laptop with square head with a thread in the middle
If you adapter is not included as above, pls contact seller for online help.

Tips:
Low shutdown current for 5V port:70mA
Low shutdown current for 12V port:150mA
Low shutdown current for 20V port:200mA
High shutdown current for 20V port:>5A
If your laptop turn off automatically for several seconds or minutes, it may caused by overcurrent protection. Please close the screen of your laptop, and then use our power bank to charge the laptop.
Can charge Surface Pro 3(but need buy the cable yourself-DC5.5*2.1mm to surface pro connector)
Cann't charge Surface Pro 4(DC 15V)
Can not take on airplane

• REAL ULTRA HIGH CAPACITY 50000mAh/185Wh: Compatible With Most Popular Laptops and Notebooks( Can not Charge Laptop with DC Current Over 5A).We Provide 10 Kinds of Connector for Most of the Popular Laptops (Pls Make Sure the Connector Fits for Your Laptop before purchasing.). Once Fully Charged, Our K2 Portable Battery Pack Can Charge Your iPhone 6 Plus about 11 Times, iPhone 6 About 17 Times, Galaxy S6 Almost 11 Times
• All IN ONE FAST CHARGE: It Has 6 Output Ports. One 20V/3A for Laptops, one 12V/2.5A for Digital Cameras, Two 5V/2.1A and Two 5V/1A For Most of Smart Phones, iPad, Tablet and More USB-Charged Devices. You Can Charge Several Devices Simultaneously to Save You Much Time. Ultra Energy Saving & Fast Charging Speed with DC input:16.8V/2.5A, OUR K2 Battery Pack Can Be Recharged in Just 6-8 Hours
• SAFETY PROTECTION: Effectively prevents your devices from overcharge, overcurrent and short circuits as well as Constructed with Lithium-ion Polymer Battery Cells&Built-in 6 Security Protections to Ensure Safety Use and 1000+ Recharge Cycles. Four Intelligent LED Indicators Show the Remaining Power Capacity.
• ALUMINUM ALLOY SHELL DURABLE TO USE: The Size is Only 8.1" x 5.3" x 1.3" And Weight 2.77lb, designed to be comfortable to carry with no square edges, so much better for travel & hiking, superlight and easy to fit in your backpack, baggage.
• WHAT YOU CAN GET: 1 x Laptop Power Bank, 1 x AC Charger, 1 x USB Cable, 1 x DC Adapter, 10 x Laptop Charge Connector, 1 x Multifunction Bag, 1 x English User Manual

REAL ULTRA HIGH CAPACITY 50000mAh/185Wh: Compatible With Most Popular Laptops and Notebooks( Can not Charge Laptop with DC Current Over 5A).We Provide 10 Kinds of Connector for Most of the Popular Laptops (Pls Make Sure the Connector Fits for Your Laptop before purchasing.). Once Fully Charged, Our K2 Portable Battery Pack Can Charge Your iPhone 6 Plus about 11 Times, iPhone 6 About 17 Times, Galaxy S6 Almost 11 TimesinTell