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It supports 4 outlets that are individually controlled (there is a knob on the top to choose if you want all four to blink the same or blink different to the music.) If you have more than 4 strings of lights, then you can plug in multiple into each outlet (up to the recommended 400 wattage per plug). There does not seem to be a way to synchronize multiple base units together, so that they would play the same song. If you had extra receivers they would still use the same 4 channels and the wattage per plug would be reduced -- "For example, if you buy two extra receivers (total of 6 now), each receiver can only have 280W so that the 1680W max will not be exceeded." (http://support.mrchristmas.com/)
Sorry, there was a problem. Please try again later.If you would like to use multiple receivers with this you can you just have to buy two units each unit comes with four receivers and one transmitter. Just use the other receivers and hook up hazard lights I've already used 8 receivers for one transmitter and never had a problem. But also do yourselves a favor cover up your transmitters with something because they are not waterproof and neither is your transmitter so keep that out of the way of water.
Sorry, there was a problem. Please try again later.I don't think so, most likely they will interfere with each other, and the receivers will probably connect to the closest transmitter, if they work at all.
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