[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 should be replaced regularly; each pad can last for 2030 uses.[How to maintain them?] Clean and dry your skin before use. After using the gel sheets, stick them back to the cardboard to preserve adhesion.Gel sheets are consumables. Replace with a new sheet in the following cases:1. When you noticeably feel decreased conduction performance or reduced effectiveness.2. When the adhesive surface (gel) 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 attached to the transparent film should be placed on the skin.Color: BlueMaterial: HydrogelSize: 4 x 6 cmPackage Contents: 48 x ABS Trainer Replacement Gel SheetsNote: The package includes only the items listed above; other products are not included.Note: Lighting and display differences may cause slight color variations between the image and the actual item. Measurement error allowance is +- 13 cm.