GTB-HDFST-148-BLK is the model number for the Gefen ToolBox 1:8 Splitter for HDMI with Fast Switching Technology (FST) and 3DTV. This device splits a single high-definition audio/video source to up to eight HDTV displays simultaneously without signal loss, supporting up to 1080p Full HD resolution and features like 3DTV pass-through, Deep Color, and lossless audio formats. 

Function: 

It takes one HDMI input and creates eight identical HDMI outputs.

Key features:

Fast Switching Technology (FST): Improves the HDMI authentication process to provide faster source switching and reduces flickering caused by HDCP authentication.

3DTV Pass-through: Supports 3D video signals.

Resolution Support: Works with resolutions up to 1080p Full HD, including 12-bit Deep Color.

Audio Support: Handles lossless audio formats like Dolby TrueHD and DTS-HD Master Audio, as well as LPCM 7.1.

EDID Management: Includes Auto-EDID management for better compatibility between sources and displays.

Compatibility: 

Can be used with DVI sources or displays by using an HDMI-to-DVI adapter or cable.

Physical: 

The "blk" in the model number stands for black, and it is a wall-mountable device.