Why Do You Choose INAVAMZ Shower Head? Unique design shower head system is space saving, you can experience the same showering experience as 3-Way rainfall combo while much easier to storage and use. How Does the Dual Shower Head Work? Only flow water from handheld showerheads: 10 Settings from handheld shower. Only flow water from Fixed Shower Head: only 1 setting of this way. Simultaneous Flow from Rainfall Shower Head and Handheld Shower Head: 10 settings to adjust. Warm Tips: Adjust the pressure mixed water through the black knob beside fixed shower head to meet your needs. Easy installtion of shower head set: 1.Wrap teflon tape around the shower arm threads, rotate clockwise to connect the fixed shower head to the shower arm. 2.Connect both ends of the hose to the fixed shower head and handheld shower head (No need to distinguish which end is connected to the handle) 3.Place the handheld shower head inside the fixed shower head from top to bottom