Keep your laptop powered up with the HP 45W Smart AC Adapter for Select HP Notebooks. This adapter connects your compatible HP laptop to a 240/110V AC outlet. This adapter will both charge your laptop’s battery, and give your laptop a continuous power source for when you need to use it for extended periods. This is the new style 19.5v 2.31a power adapter from Hp which fits the new line of Hp notebooks, notebooks, Ultrabooks and TouchSmarts. This is a genuine Hp 19.5v 2.31a laptop charger.