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Metallic construction. Easy to mount to the ceiling with the V shaped spring catch mechanism. Push in type input terminal block makes cable connections easy and allows bridge wiring. Input impedance can be easily changed by changing the tap position of the transformer with 0.8W, 1.5W, 3W and 6W at 100V and 0.4W, 0.8W, 1.5W and 3W at 70V. Ideal for use in a voice alarm system.
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