Product Features: easy to paste, no skin allergies, no dry, conductive gel, long-term storage, clinical E, after use, no residue, manufacturing process, advanced product quality, stable and effective, scientific design concept, easy to use, excellent electrical performance, clear ECG waveform Instructions : 1. Clean the electrode placement site with sand or alcohol. 2. Link electrode lead wire. 3. Remove the electrode from the backing paper. 4. Press the electrode backing 5. at the use site. Fold the opened bag into two layers.