The Adapter is a 33W rated power supply and replaces asus AD891M21 laptop charger. Designed to meet Asus’s original specifications. The Replacement Asus AC Adapter is designed to be 100% manufacturer compatible and will meet OEM specifications.Keep your adapter in a dry place with room temperature. Just like other electronic devices, adapter can get damage cause by high temperature.Avoid the metal tip of the adapter from getting in contact with other metal objects because it can cause short-circuiting. Your laptop might get damage when a short-circuited charger is used.Replacement For Asus AD891M21 Adapter is rated at 19V 1.75A 33W.The high quality laptop charger for asus AD891M21 provides your laptop with safe and reliable power.It is over Charge protection, Voltage protection, Temperature protection, Short circuit protection, enjoys 1-Year Warranty,60-Day Money Back! High quality Asus AD891M21 laptop AC adapter. Sealed for protection against moisture and humidity. Laptop safeguard features against incorrect voltage, short circuit, internal overheating. 100% compatibility with the original.