MX925 POS terminal overlay skimmer is a type of credit card skimming device that used to retrieve payment card information (credit or debit card numbers, PINs, etc.) during a legitimate transaction at a point-of-sale (POS) terminal. The skimmer is a small, covert device that is attached (or "overlays") onto a POS terminal over the card reader and keypad. This is very popular product because of size and easy installation features.