About this item❄ Waterproof - HECHUAN sensor covers for libre 1/2/3 is transparent and waterproof,you are free to swimming,shower,rain etc.❄ No glue on the center - The adhesive patch specially designed with no hole and no glue on the center,if you need change the patch it will not tear your sensor off.❄ Long lasting - Comfortable and durable materials make the overpatch last 14 days and do not effect sensor’s date reading.❄ Easy to use - Just tear off the backing paper you can use the sensor covers easily.