Large QuantityThere are 30 sensor patches in total, which is a huge quantity to meet your needs. The patch is composed of 3 parts of backing paper. It is easy to stick to the exact position on the sensor cover. Natural CottonThis large size (2.95 inches in diameter) freedom sense patch is made of cotton, which makes the skin breathable, stretchable and elastic. Latex-free and hypoallergenic. The elastic cotton allows your skin to breathe easily. The fixed adhesive patch is harmless to your health. Sensor ProtectionThe sticky waterproof patch for freedom sensor sticks reliably, it is hypoallergenic and latex-free, and will not leave any residue on the skin even after 14 days. Non-sticky in the middleThe sticky waterproof patch will not stick to the sensor, but it will protect the area around the sensor and will not damage the sensor if you need to replace the patch. It is the best choice for your skin and freedom sensor! Wide ApplicationThe sensor patch is easy to use by yourself without other help. In addition, you can read it easily by tape. The sensor is waterproof and the covering patch is suitable for showering, exercising and sports activities.