WATERPROOF, BREATHABLE & LONG LASTING: This transparent sensor patch is waterproof and breathable, allowing your skin to breathe freely while protecting it. In addition, it adheres reliably and ensures a very long service life, it lasts over 14 days and 14 showers. No hole and no glue in the middle: large size (diameter 9 cm) Freestyle adhesive plaster, but without hole and glue in the middle for full protection and easier changing if necessary (does not stick to the sensor). Easy to install and read: pre-cut paper on the back, easy to use by yourself, no further help required. You can also easily read through the plaster. Hypoallergenic adhesive: latex-free medical material, breathable and comfortable, leaves no residue on the skin. Material: transparent color Material: TPU, black khaki Material: elastic cloth + acrylic glue, Product size: 11 * 7.8cm.