Parents struggling to get their kids to revise in the run-up to exams can now keep them at their desk using a ball and chain that only unlocks when they have studied for long enough. A red digital display counts down the "Study Time Left" and the device beeps and unlocks when the time expires.
The prison-style device weighs 9.5 kg (21 pounds), making it difficult to move while wearing it. It cannot be locked for more than four hours and comes with a safety key that allows the manacle to be opened at anytime.
The ball and chain costs £75 and is sold online at curiosite.com.
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