When used on your land line telephone, the recorder willpower down (stand-by) when you hang up and power on when you pickup thus extending the life of the batteries. All other telephonerecorders continue to use the batteries even when they are in VOR(Voice Activation recording). The sensitivity to sound/voice canalso be adjusted.
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This is some of the finest covert voice recording technology. Built to a very high specification with many superb features, this superb voice activated recorder that is disguised as a car key fob recorder is certainly a very popular 'carry anywhere' audio recorder.