 An advantage is that there is less wiringduring installation and reducing the costs. The dome lights in the hallway still usually require wiring for power.
<clarity>  An advantage is that there is less wiringduring installation and reducing the costs. The dome lights in the hallway still usually require wiring for power.
 An advantage to wireless call buttons is that installing them requires less wiring, reducing their cost. However, dome lights in the hallway still usually require wiring for power.