The Asus X502C-RB01 is the UK version of the Asus X502CA, released in 2013. This model of the Asus has an Intel Core i3 processor versus the Intel Core i5 processor in the X502CA model. With this exception, the Asus X502C and Asus X502CA are identical.
This model bears an Intel Celeron 1007U Core i3 processor running at 1.5 GHz with integrated Intel HD graphics. It contains 4 GB of DDR3 RAM and a 320 GB hard drive. Its 15.6-inch screen is a LED-backlit display with a resolution of 1366 x 768 and 16:9 aspect ratio. This model also includes unique features such as Smart Gestures using the touchpad, a quick boot up time of 2 seconds, and IceCool palm rest technology.
You can determine which model of the device you have by finding the sticker label on the bottom of your device and identifying the model number.