and vibrates when you make spelling errors.
Lernstift is a regular pen with real ink.
But inside is a special motion sensor,
and a small battery-powered Linux computer with a WiFi chip.
Together those parts allow the pen to recognise specific movements,
letter shapes and know a wide assortment of words.
It will vibrate if it senses bad letter formation or messy handwriting,
Read More:
http://news-by-manoj-kargudri.blogspot.com/2013/07/smart-pen.html
http://www.indianexpress.com/news/now-smart-pen-that-vibrates-when-you-make-spelling-error/1141693/
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