answering machine
bluetooth
broadcast
bubble
call
camera
carrier pigeon
chat
communication
computer
connection
contact
discussion
documents
email
fax machine
finger
gps
handycam camera
information
internet
language
letters
loudspeaker
magazines
megaphone
message
microphone
mobile phone
music player
newpapers
online messaging
phone
post office
printing
projector
radar
radio
router
satellite
sign language
speech
talking
tape recorder
telegraphy
telephone
telescope
television
text
video camera