[What's it for?] Hydrogel gel sheets, accessory for Abdominal Belt, AB Trainer, Waist Trimmer Belt, ABS Toner Body, ABS Stimulator. [How long can the gel sheets last?] The gel pad needs to be replaced regularly. Pad life can last 20–30 uses. [How to maintain?] Clean and dry your skin before use. After using the gel sheets, stick them back to the cardboard. Gel sheets are consumables. Replace with a new sheet in the following cases: 1. When you notice a decrease in conduction performance, leading to reduced effectiveness. 2. When the adhesive surface loses stickiness, dries out, or has damage or dirt that cannot be cleaned. How to use: The side attached to the white paper should be applied to the device. The side with the transparent film should be placed on the skin. Color: blue Material: hydrogel Size: 4 x 6 cm Package Contents: 48 x Abs Trainer Replacement Gel Sheets Note: Light and display differences may cause slight color variation between the image and the actual item. Measurement error is +/- 1–3 cm.