I would like to switch the led's of 4 of these LED tactile buttons (LED Tactile Button - Red - COM-10442 - SparkFun Electronics) on/off using one pin on my Pro Mini 5v. The data sheet for the buttons doesn't give much detail about the LED but a user in the comments at the bottom of the product page has suggested they are 'red led juice = 2vdc 50mA'.
As the user's comments on that SparkFun listing shows, there is almost no technical information of the pin out, and typical usage of this LED lighted switch. I would assume it's two independent devices, a simple momentary SPST switch and a independent LED. It's not clear if the led has an internal current limiting resistor or not (I would bet no). So unless you have experiance with electronic components and can figure out how to wire and use this, I would wait for SparkFun to provide more and better information rather then just publishing the datasheet written in Chinese.