Note: Please allow slight error due to manual measurement. Thanks for your understanding. specification: Item Type: Sensor Adhesive Patch_x000D_Material: TPU_x000D_Size: Approx. 11 x 7.8cm / 4.33 x 3.07in_x000D__x000D_4.2 x 2.1 x 1.5cm / 1.65 x 0.83 x 0.59in Features: 1Sensor Fixation: Reinforcement strip used for fixing the sensor (not included), support the body's natural range of motion. 2Safe Use: Sensor adhesive patches are made of TPU material, hypoallergenic and latex free, mild and non irritating, has no harm to skin. 3Firmly Stick: Sebsor adhesive cover with good stickiness, can stick on your skin firmly, not easy to fall off, and easy to remove after use. 4Package Included: A total of 10pcs of sensor cover are available for use, meet your replacement needs, suitable for different occasion. 5For Daily Activities: After attaching the sensor adhesive patch, you can run, walk, swim and take a bath, and do your daily activities. PackageList: 10 x Patch