Bloody B840 Keyboard Review 29

Bloody B840 Keyboard Review

Packaging and Accessories »


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Bloody Gaming is a brand owned and operated by A4Tech, a PC hardware company established in Taiwan in 1987 who has had a relatively small presence globally until now. With the PC gaming peripherals market proving to be one of the most profitable sectors for the DIY market, A4Tech wanted a piece of the pie and recently established the Bloody brand with an emphasis on optical switches. Today, we take a look at their new B840 keyboard with LK2 Blue optical switches.

What are optical switches, you ask? Contrary to mechanical switches, which have moving parts built into the switch which when pressed down actuate a keystroke, an optical switch depends on the interruption (or continuation) of an optical signal to register a keystroke. Bloody introduced this function in their Lightstrike technology two years ago, with a linear switch that interrupts an infrared light signal as seen here:

The animation above depicts a linear switch, which is what Bloody was operating with for optical switches so far as the very operating principle requires the switches to travel up and down linearly. However popular linear switches are, some people still prefer those with tactile or clicky feedback. Bloody came up with a solution that integrates metal knobs on the outside that, when the switch is actuated, travel to hit the switch's wall for a clicky sound. When the switch travels back up, the leaves move back to their normal positions. This is part of their new lightstrike LK2 technology featured in a switch they aptly call the LK2 Blue.


Bloody B840
Layout:104 (+3) keys
Material:Plastic and aluminium alloy
Macro Support:Yes
Weight:0.91 Kg / 2.00 lbs.
Wrist Rest:No
Anti-Ghosting:Full N-Key rollover
Media Keys:Available as a secondary function
Dimensions:150(L) x 463(W) x 40(H) mm
Cable Length:1.8 M
Switch Type:Bloody LK2 Blue Switches
Warranty:1 year
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May 19th, 2022 09:26 EDT change timezone

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