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Pololu RC Servo Multiplexer 4 Channel (assembled)

Vendor's Description: 

This compact device serves as a four-channel multiplexer of hobby radio control pulses, allowing easy switching between two independent signal sources. A fifth channel selects whether the output is from the master or the slave source: a pulse width below the threshold selects the master channels, while a longer pulse width selects the slave channels. This version comes with header pins soldered in.