Safety: UL Listed. This item is up to UL's nationally recognized standards for high-level electronic safety. Attention: This Charger is compatible with 4.0mmx1.7mm Charging Connectors. (Not Work with 3.0mmx1.1mm Connectors Size, Please Check Your Laptop). Compatible with Lenovo Ideapad Series, Ideapad Flex Series, Yoga Series Laptop. If you have any problem please contact us feel free.