Tripp Lites B130-101 allows you to connect a VGA monitor up to 500-feet away from a computer using ordinary CAT5E/CAT6 cable. Ideal for digital signage situations, such as retail, schools, church, etc. The local unit (transmitter) also allows for connection of a monitor near the source computer. Remote unit contains equalization length (EQ) and brightness (gain) adjustment screws for crystal clear images small screwdriver is included with the unit.