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Designed by ETS the SA4 is a 4 channel speaker driver which can be used in combination with two-way remote monitoring multi-zone surveillance systems. The SA4 consists of 4 RCA patch cords with a 16.5VAC AC adaptor, as well as easy cable run terminations and reverse polarity protected + refused. The SA4 is able to drive a speaker up to a distance of 1000ft away with use of a 70V line and is compact in size, plus can handle a frequency response of 200-10kHZ. It is also easy to setup, use, plus comes affordable for most users saving on time and money.