Ac Power Adapter Charger for ASUS TX300 TX300CA Laptop Notebook Computer This is a High Quality Power supply AC Adapter Charger for ASUS TX300 TX300CA Laptop Notebook If you are running your computer on AC power with a battery installed, this adapter charges the battery (if needed) and maintains its charge. When the system is off, the AC adapter will charge the battery and then maintain its charge. Fits For ASUS TX300 TX300CA laptop