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The SZI 30 from Sennheiser is a DC-powered IR emitter designed to be slaved to an SI 20 transmitter to increase the effective coverage area of the SI 20. Up to three SZI 30 units can be added to an SI 20.
Extend the coverage range of your SI 20 transmitter
In the Box
Sennheiser SZI 30 - Slave IR Emitter Panel for SI 20