Please check compatibility with your laptop carefully as laptop models do vary.Ensure you have the correct Tip Size, Output Voltage and Amp Rating from your previous charger.The AC power adapter enables you to operate your laptop or charge the battery from electrical power outlets.If you are running your computer on AC power with a battery installed, the adapter charges the battery ( if needed ) and maintains its charge.Tip Size: 3.0 x 1.1 mmOutput: 19V 2.37AUK Three-Pin Power CordHigh quality replacement laptop charger designed to work identically to your original adapter. Guaranteed to meet or exceed the specifications of the original and ensure that they comply with strict UK and EU regulations. The package is sealed for protection against moisture, humidity and contamination.You could also use it as a spare AC adapter so you can charge your laptop at work or elsewhere without having your original AC adapter with you all the time. Laptop chargers can be used in any country throughout the world as long as you have a suitable power cable; Included a free UK power cord with every charger we ship. Manufactured to strict and stringent quality standard certificates: CE, RoHS, etc.Box contains:1 x compatible charger unit1 x power cableCompatibility:     Asus Zenbook UX21 / UX21EAsus Zenbook UX31 / UX31EMedion Akoya S6214T, MD99380, MD99440Please check your specifications