Since the gel pads are consumables, you are supposed to replace with a new one in following circumstances：
i.When you obviously feel the decrease in conduction performance and strength.
ii.When gel pad loses its adhesiveness.
iii.When its surface dries out/damaged/gets dirty.
⇨ Clean and dry your skin before use.
⇨ Put it back into the box after use.
⇨ Usage Times: About 30 times in good maintenance.
30 * Replacement Gel Pad