A4Tech Co., Ltd. is a Taiwanese computer hardware and electronics company headquartered in Taipei, Taiwan. A4Tech Co., Ltd. was founded in 1987. Its products include computer peripherals such as keyboards, mice, PC cameras, hubs, headsets, speakers and gaming devices.Founded in 1987, A4Tech Corp specializes in the design and manufacturing of PC peripherals and accessories.

CEO Robert Cheng established It in 1987.

As of 2015, It has turned its attention to the North American market with a new gaming brand – Bloody.

In 2011, It launched its secondary PC gaming brand – Bloody Gaming. Initial products focused around integration of optical switches into gaming peripherals – specifically keyboards and gaming mice.

At the CES 2018 expo in Las Vegas, Bloody introduced the third generation of Light Strike technology (dubbed LK Libra) and launched its full upgraded keyboard portfolio by February 2018.