It& 39;s Waterproof - It& 39;s proven to be waterproof, so you don& 39;t need to worry about showering, raining, swimming, etc. (without sensor)14 DAYS LONG-WEAR PROTECTION - Its reliable stick guarantees long lasting 14 days. The adhesive is hypoallergenic and latex-free, leaving no residue on the skin even after 14 days.Non-stick center: it won& 39;t stick to your sensor, but protect it around in case you need to replace the patch, it won& 39;t cause damage to the sensor.NATURAL COTTON MATERIAL: This large size (3.15" diameter) free sensor patch is made of natural cotton material which is breathable, stretchy and flexible.EASY TO USE AND EASY TO READ: 3-part pre-cut paper, easy to use by yourself, without the help of others. Also, you can easily read from tape as usual.