Electronic bleeper (5)
I believe the answer is:
pager
(Other definitions for pager that I've seen before include "Small radio bleeper for contact" , "One calling" , "Bleeper device" , "Contact device" , "It alerts those on call" .)
I believe the answer is:
pager
(Other definitions for pager that I've seen before include "Small radio bleeper for contact" , "One calling" , "Bleeper device" , "Contact device" , "It alerts those on call" .)