PLEASE NOTE: This product includes only the arm band. Sensor sold separately. The Libre holder has been specially designed by a diabetic user to ensure it is fit for purpose. The product will arrive assembled and ready to go – simply adjust the strap to provide a comfortable fit. Using 3D printing technology to deliver an ergonomic and stylish design, this holder provides excellent protection for your sensor, allowing it to be secured during everyday use. Users of this product who engage in swimming and extreme exercise are encouraged to purchase an additional holder, as this will allow you to have one clean and ready for when your workout routine has finished. If there is excess strap after you have adjusted the product to fit, this can be cut off with scissors and the end can then be sealed with a flame to ensure a clean edge. * The elastic in this product has been Thread-locked using "Pyrm Fray Check" fabric glue. This will prevent fraying of the fabric and ensure the edges are clean and smooth. If the band is cut shorter, super glue should to be applied to the ends. Please be aware that using a naked flame to seal edges of the strap may result in burn marks on the fabric. My Holder is not designed for hot tubs above 40 degrees or to be left in direct sunlight to dry out, this may cause the product to shrink, please do not tumble dry, simple washing up liquid in a bowl left overnight and then to air dry is most effective in keeping the product clean.