Note: 1. Please allow slight error due to manual measurement. Thanks for your understanding._x000D_2. This product does not contain sensors. specification: Item Type: Patch for Sensor_x000D_Material: Cotton_x000D_Size: Approx. _x000D_11 x 8cm / 4.3 x 3.1in_x000D_3.5 x 2.2cm / 1.4 x 0.9in Features: 1Good Stickiness: The bottom of the patch comes with stickiness, sticks to the skin, it is not easy to fall off, convenient and firm, ensure long lasting use. 2Safe To Use: After attaching it, you can run, walk, swim and take a bath, and do your daily activities. These patches are hypoallergenic and latex free, mild and non irritating. 3High Quality Cotton Fabric: As a natural fiber, cotton has good air permeability and soft touch, safe and eco friendly, skin friendly, comfortable to use. 4Easy To Use: Thin and flexible, the easy to tear backing sticker makes sticking a breeze and easy to remove after use, bring you convenience. 510pcs Sensor Patch: 10pcs of sensor cover are available for use, meet your replacement needs, light weight and small, suitable for different occasion. PackageList: 10 x Patch