Adder AV (Audio/Video) Extenders have gained a global reputation for signal quality, reliability and ease of use. Adder AV Extenders can be found in applications such as digital signage, public information systems, high profile electronic bill boards or anywhere you want to distribute high quality Audio and Video over long distances. As well as Audio and Video extension, the Adder AV Extender systems can also be used for RS232 control and management.