1PRECUT MIDDLE: Adhesive patch adopted hollow middle design, will not stick onto your sensor, brings no damage to the sensor when you change it. 2WATERPROOF: Sensor adhesive patch has been proven to be waterproof, therefore, you do not need to worry about shower, rain, swimming, etc. 3FIRMLY ADHESIVE: Sensor cover has long lasting adhesion, does not contain any allergenic substances, which is not easy to fall off for durability. 4PACKAGE INCLUDED: A total of 100 sheets of adhesive patches, enough quantity to meet your daily needs for running, walking, swimming and bathing, etc. 5EXCELLENT ABS: Sensor adhesive cover is made of excellent ABS fabric material, which is soft and skin friendly, breathable, stretchable and flexible for you to use.