Features: 2.5mm x 0.7mm Compatible with Asus- 19V 1.58A.etc. 3.0mm x 1.0mm Compatible with Acer Samsung Ultrabook. 4.0mm x 1.35mm Compatible with Asus- 19V 2.37A,19V3.42A. 4.0mm x 1.7mm Compatible with L-enovo Ideapad 20V 2.25A,20V3.25A. 4.8mm x 1.7mm Compatible with Hp 18.5V 3.5A. 5.5mm x 1.7mm Compatible with Acer 19V3.42A. 5.5mm x 2.5mm Compatible with L-enovo Asus- Toshiba......Laptop Adapter. Reduce the frequency of plugging and unplugging. Prevent dust to ensure stable connection. Square Plug Compatible with L-enovo Thinkpad Yoga 20V3.25A 20V4.5A. The magnetic design does not require frequent plugging and unplugging to protect the computer interface. Package Includes: 1x Laptop Power Connector Specifications: Material:Aluminum Alloy Type:2.5x0.7mm,3.0x1.0mm,3.5x1.35mm,4.0x1.35mm,4.0x1.7mm(Black),4.0x1.7mm(Yellow),4.5x0.6mm(Black),4.5x0.6mm(Blue),4.8x1.7mm,5.5x1.7mm,5.5x2.1mm,5.5x2.5mm,6.0x0.6mm,Square Plug Net Weight:9-10g note: Please allow 1mm errors due to manual measurement. Due to the difference between different monitors, the picture may not reflect the actual color of the item. Note: Due to the light and screen setting difference, the item's color may be slightly different from the pictures. Please allow slight dimension difference due to different manual measurement.