Hey guys, looks like an amazing price on a Creality BL touch kit - around $50+ elsewhere.
Great for those who are interested in auto bed levelling (an essential, really) or handy as a spare.
This probe is to help automatically work out where the bumps and dips are on the print bed (printing surface) of a 3d printer so that your prints adhere properly and, generally, increases the chance of a successful print.
EDIT: Due to bargaino's perhaps unnecessarily excessive comment, I've added a description of what this is used for.
Brilliant stuff dude, thank you