Clean and dry the back of your watch. Make sure the surface is smooth and mostly flat. When your X1 is charged, take it off the charger. Place the X1 in the center of the back of your watch with the microsuction side facing the watch. Press firmly for a few seconds until the X1 is secure. Wear your watch so it fits snugly. The X1 should stay in contact with your skin throughout the day for the best measurements. X1 works with both watch straps and metal bracelets. If you wear a metal bracelet, you may need to add or remove links for a better fit.

You can move your X1 between compatible watches or to the included sleep band at any time. To remove the X1, gently lift around the edge of the device. Do not pull from the center. The sleep band includes both a silicone strap and an elastic strap. It also works with any standard 18 mm watch strap. The microsuction surface can be replaced if needed. See the Microsuction Replacement Guide for instructions.