The HDMI splitter is a specialized accessory that is used to split an HDMI signal into many, which can then be connected to multiple display devices. An HDMI cable usually has an end that goes into the device output and another end that has two or more HDMI outputs that have been split from the single line. Alternatively, hardware splitters are connected to the output device via an HDMI cable and are used with an external power source to split the signal among multiple display devices. These cables can be configured to easily split a line among four or more displays at once.