article_snippet.sent: The board and fans are pictured .
article_snippet.sent: Inside the 0.19-inch (5mm) thick case is a pair of 'virtually silent', 0.07inch (2mm) micro-fans with air flow of 1.3 litres per minute. 
article_snippet.sent: Amited is also fitted with an ultra-thin heating coils attached to the back of a conductive copper plate.
article_snippet.sent: Optimal's sensors are pictured.
article_snippet.sent: Optimal is fitted with temperature sensors, resistance coils and two 2mm micro-fans.
highlights_snippet.sent: While built-in resistance coils gently heat the device if it gets too cold .
  