Hi Ana, Thank you for your question. To add a hand shower to your existing rain showerhead you must have some way of diverting the water to the hand shower. You can use a shower arm mount diverter like the U4929-SS-PK that attaches on the shower arm behind your existing showerhead. The other diverter choice involves plumbing a diverter valve the R11000 behind the wall, adding on a matching diverter trim to control the shower functions. Both 3 setting diverters will give you the option of using each showerhead individually or both at the same time. You may want to look at the model 55411-SS which also includes a wall mount for the same 59411-SS-PK handheld showerhead.