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·Voltage: 24V DC nominal . 18 - 30V DC acceptable .
·Current consumption: 20 mA with speech, 30 mA with sig nal lamp activated .
·Talk: Push on/push off, self indicating switch .
·Listen level: Thumbwheel operated potentiometer .
·Dimensions : (H x W x D): 50 x 96 x 105mm
·Weight : 0.35kg
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