Smart® Caregiver Easy-to-Install™ Emergency Call Button & Light System This Emergency Call Light System includes a wireless nurse-call button with pull-cord, a wireless reset button, and a call alarm with light. Ideal for bathroom and hallway notification systems. All components are easily mounted on most surfaces with no hard wiring required. When call button is pressed or call button pull-cord is pulled, a wireless signal is sent to the Call Light, which alerts audibly and visually. Call Light requires four C batteries, not included.