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The SA1 is an ETS speaker drive which is used with two-way audio remote monitoring surveillance systems. The SA1 in combination with a 70V line can easily drive the speaker to a distance of 1000ft away and includes an RCA patch cord with a 12VDC AC adaptor. The SA1 also features reverse polarity protected/fused while also consisting of easy cable run termination. It is an easy to use speaker drive which also comes affordable for most users saving time and money.