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SpeakerCraft SonicAir SA 2.1 NOS Wireless Transmitter Receiver Amplifier New
New Old Stock In The Box. The SA 2.1 Transmitter can connect to just about any audio source. It then broadcasts audio content as wireless RF (radio frequency) signals to the SA 2.1 Receiver, that can be placed up to seventy feet away (depending upon the local RF environment). Amplifier produces 50 watts per channel at 4 ohms.