Note: 1. Please allow slight error due to manual measurement. Thanks for your understanding._x000D_2. Monitors are not calibrated same, item color displayed in photos may be showing slightly different from the real object. Please take the real one as standard specification: _x000D_Item Type: Electrode Pad_x000D_Material: Hydrogel_x000D_Size: Approx. 4 x 6cm / 1.6 x 2.4in_x000D__x000D_1. When should it be replaced:_x000D_(1) When the conductive performance is obviously decreased, the strength is decreased._x000D_(2) When the stickiness is lost. The adhesive surface (gel) has dried out or has gouge marks or unremovable dirt._x000D_2. How long can the gel sheet be used?_x000D_Answer: About 30 times, if you use and maintain them correctly._x000D_3. Cleaning/drying before use: stick back to the sticking board after use_x000D__x000D_Tips:_x000D_1. When the patch is not sufficiently viscous or sticks to foreign objects, please wipe the surface with clean water with your fingers and dry it in a ventilated and dry place before use._x000D_2. Replace the gel sheet after about 30 consecutive uses._x000D_3. If there is no host device, the gel pad cannot be used alone. It is a replacement gel pad for abdominal muscle stimulator. Features: 1Use with an abdominal muscle training device to transmit the current to your body area more effectively. 2The electrode sheet has better adhesion than other rubber pads. Latex?free hydrogel is perfect for sensitive skin. 3If used and maintained correctly, the gel pad can be used continuously for 20 to 30 times. 4Made of high quality material, safe and eco?friendly, non?toxic, stable and practical for use. 5Light weight and in small size, can be easily stuck on muscle patch, bring you convenience. PackageList: 2 x Electrode Pad