Waterproof - LANOU waterproof sensor covers for libre 3 is much smaller and suitable than the normal one to help you feel free in swimming,shower and any other water activities. 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 sensors date reading. EASY TO STICK - Just tear off the backing paper you can use the sensor covers easily.package contents: 10/20/30/50/100pcs sensor covers<br>Note: <br>1. Please allow 1-3 mm error due to manual measurement and 1-3g weight error make sure you don't mind before ordering. <br>2. Due to the lighting of the photos and the difference of monitors, the pictures may not reflect the actual color of the real item. Please make sure you don't mind before ordering, thank you!<br>About Shipping: <br>1.please pay attention to your delivery address such as: name, street, house number, doorbell/email without name, etc. is correct, or the order will not be delivered correctly.<br>2.All items will be shipped within 3 business days after the payment is received. Most times you will receive them within 8-12 days then. The specific delivery time is depend on circumstances.<br>3.During the shopping process, if you have any questions, please feel free to consult us, we will reply you within 24 hours, wish you a happy shopping!