英文關鍵字
battery
cell
charge
charger
connector
device
digital
electric
electronic
energy
smart
rechargeable
recharge
power
portable
modern
mobile
gadget
equipment
usb
white
background
cellphone
powerbank
plug
cable
adapter
supply
charging
connect
lithium
black
display
electricity
flashing
connection
accumulator
unit
diode
flash
indicator
technology