A4Tech Co., Ltd was established by Robert Cheng in 1987 as a computer hardware and electronics company that specializes in the design and manufacturing of PC peripherals and accessories. The company's main motivation has driven by honesty, reliability, and excellent customer service throughout the world.

In the year 2011 they have launched their secondary PC gaming brand Bloody in the market with the integration of optical switches into gaming keyboards & mouse. The development of this brand considers the professional gameplay of the gamers that leverages A4Tech's manufacturing strength. The “bleeding-edge" technology of bloody enables Light Strike optical switches for the keyboard. Furthermore, they have developed a unifying message for the gaming culture of emerging eSports called “Bound by Gaming. Bound by Innovation”. Bloody has introduced the third generation of Light Strike technology at the CES in 2018.