Earthing patches are similar to the ECG/EKG electrode patches commonly used by doctors for testing purposes. When used for Earthing, you simply apply them to the skin on some part of the body, such as a site of tenderness or pain. One end of the accompanying Earthing cord snaps onto the patch. The other end connects to a grounded wall outlet or ground rod. Each order comes with 30 disposable patches and an Earthing cord.