A real workable skimmer will cost more. This is smart development.
Check out its full specifications before buying it.
Also, the skimmer can transmit data both by contact and contactless.
All data will be transferred to the device you need - a phone or a server.
Skimmers are supplied in different sets, check this with the seller, as well as the model of ATMs to which it fits.
Never buy prepaid skimmers from unreliable sources, use an escrow deal for this.
You can also consult on the choice of a quality stealer at the services that offer dump + pin cashing.