Bloody B840 LK Optic Mechanical Keyboard Review


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Bloody B840 LK Optic Mechanical Gaming Keyboard Review

By David Ramsey

Manufacturer: A4Tech / Bloody Division
Product Name: B840 LK Optic Mechanical Keyboard
UPC: 4711421924689
Price As Tested: $99.99 (Amazon | Newegg)

Full Disclosure: A4TECH’s Bloody Division provided the product sample used in this article.

A4Tech is a Taiwanese company whose “Bloody” gaming division was launched in 2012. Bloody produces gaming keyboards and mice using a unique switch technology: rather than metal contact points closing an electrical circuit when a key is pressed, Bloody’s mechanical switches use infrared LEDs and photosensors, which Bloody claims provides faster key response and a more reliable and durable switch. Benchmark Reviews checks out the Bloody B840 LK Optic Mechanical Gaming Keyboard, equipped with next-generation “clicky” optical key switches.



  • LK key switch technology provides key response < 0.2ms
  • No double-clicking or key bouncing
  • Spill and dust resistant
  • Wear-resistant double-shot key caps
  • Keys rated for 100 million strokes
  • 25% faster keys (3mm travel as opposed to 4mm)
  • 8 silicone key caps for gaming keys
  • Gaming mode disables Windows key

Let’s take a look at this keyboard in the next section.


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