For this step, it is important to have a partner to help you hold all the respective parts.
Take the SomnoHD unit (and attached headbox) and slide the (larger) waist band connection clip into the right-hand slot on the SomnoHD.
Now hold the SomnoHD in the centre of your abdomen (just below your belly button) and wrap the waist band around your torso. Then slide the (smaller) waist band connection clip into the left-hand slot on the SomnoHD, adjusting the strap as necessary (like the chest band, it should be snug but not uncomfortable). You will need to take care during this step that the attached headbox doesn’t fall or dangle, putting strain on the connection. It is for this reason that we suggest two pairs of hands during this step.
Once the SomnoHD is securely fastened, clip the headbox to the blue strap running over your shoulder as seen below. The other velcro end of the blue strap can also be folded over the SomnoHD waist band along your back and attached back onto itself.
Finally, take the blue cable from the chest band buckle and insert into any of the ports running along the top of the Somno HD unit.