The Wireless Muscle Stimulator EMS Pad has 6 gel pads. Biceps Pad has 2 gel pads. You get a full set of replacement pads for your Abs Pad and Biceps: Full Wireless Muscle Stimulator Replacement Gel Pads (contains 10 replacement gel pads).
When should I replace it?
When you feel the performance is decreasing
When your pad loses its adhesiveness, the adhesive surface dries out or is gouged or dirty
How long can the gel sheets last?
About 30 uses if you use and maintain the product correctly.
How to maintain the product correctly?
Clean/dry your skin before using the EMS Pad; Stick the pad back to the cardboard after using it.