Crucial 4GB Upgrade for a Apple MacBook Pro 2.53GHz Intel Core 2 Duo (13-inch DDR3) MB991LL/A Mid-2009 System (DDR3 PC3-8500, Non-ECC,)

Products from the USA may come with an input voltage of 110V–120V, requiring a step-down transformer. Check the device wattage to select the correct power converter.