What is used as an energy source by pagers?
Wi-Fi photons antennae energy Heart rate fire layers of fat electricity
A B C D E F G H
Devices such as pagers and cell phones are forbidden.
 electricity is used as an energy source by pagers
What is used as an energy source by pagers? (A) Wi-Fi (B) photons (C) antennae (D) energy (E) Heart rate (F) fire (G) layers of fat (H) electricity