Feature: 1. MIDDLE NO GLUE: Adhesive patch will not stick onto your sensor but protect around it , in case you need to change the patch, it brings no damage to the sensor. 2. WATERPROOF DESIGN: Sensor adhesive patch has been proven to be waterproof, therefore, you do not need to worry about shower, rain, swimming etc. 3. LONG LASTING: Sensor cover has long lasting adhesion, which does not contain any allergenic substances, is not easy to fall off, lightweight and durable. 4. 20 SHEETS: Black adhesive patch comes in a total of 20 sheets, enough to meet your daily needs for running, walking, swimming and bathing, etc. 5. ELASTIC FABRIC: Sensor adhesive cover is made of excellent elastic fabric material, which is skin friendly, breathable, stretchable and flexible. Specification: Item Type: Sensor Adhesive Patch Material: Elastic fabric. Package List: 20 x Sheets of Sensor Adhesive Patch