barcode

bar code

cash register

check out

checkout

digital

optical

payment

price

reading

purchase

reader

scanner

scanning

shopping

beep

buying

alert

notification

point

bleep

button

click

code

device

item

product

computer

counter

gadget

message

monitor

electronic

pulse

signal

technology

scan

sound

supermarket

game

paying

tone

blip

bar

robotics

reverb

echo

pack

collection

compilation

read

pay

robotic