Please note: Round connector = 4.0 x 1.7. This item is a high-quality power supply. It is well-suited as a replacement or secondary device and provides power to your Lenovo Ideapad 100-14IBY just like your standard power supply, enabling reliable battery charging. Note: Unless we explicitly state that this is an original product, we supply a compatible product. This means it is by no means an original product from the manufacturer and is therefore not produced or recommended by them. All brand and product names are the property of their respective owners and are only used for compatibility description.