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Level A1 – BeginnerCEFR A1
2 min
78 words
- Researchers made tiny metal tags for smart homes.
- The tags are smaller than a coin and cheap.
- They do not need a battery or power plug.
- A moving part hits the tag and makes a sound.
- The sound is ultrasonic so people cannot hear it.
- A nearby wearable device can hear and record it.
- Each tag makes a different high sound.
- Tags can count actions and help monitor everyday things.
- They are quiet and protect privacy at home.
Difficult words
- tag — small label or object used for identificationtags
- wearable device — electronic item you wear to record data
- ultrasonic — sound at a very high frequency people cannot hear
- battery — a small power source for electronic devices
- monitor — to watch or check something over time
- privacy — keeping personal information private at home
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Discussion questions
- Do you have a wearable device?
- Would you like quiet devices that monitor things at home?
- Is privacy important in your home?
