The BK-402A is a high-performance 4x2 HDMI matrix switcher designed to distribute ultra-high-definition video and advanced audio from up to four HDMI sources to two HDMI displays. Fully compliant with HDMI 2.1 and HDCP 2.3 standards, it supports resolutions up to 8K@60Hz (4:2:0 10-bit), 8K@30Hz (4:4:4 10-bit), and 4K@120Hz (4:4:4 10-bit), delivering stunning picture quality with a 40Gbps video bandwidth. 

Each output can display content independently, allowing different sources on different displays. The unit also supports advanced downscaling, converting 8K content to 4K or 2K and 4K content to 2K for compatibility with lower-resolution screens. Optical and 3.5mm analog audio outputs provide flexible audio extraction, while eARC is supported between Input 1 and Output 1 to enable high-bandwidth audio pass-through for premium sound systems. 

Additional features include support for HDR10+, Dolby Vision, HLG, and high-end audio formats such as Dolby Atmos and DTS:X. With a compact design, front-panel DIP switches for EDID management, and user-friendly control via the included remote or front-panel buttons, the BK-402A is an ideal choice for home theaters, educational environments, and professional AV installations.