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External Microphone Jack — lets you use an external microphone, so you can extend your recording range.

Earphone Jack — lets you use an optional earphone to listen to a tape privately.

Quick Record — lets you instantly change from playback to record.

Tape Speed Switch — lets you record at normal or slow speed. Slow speed gives you twice the normal recording time.

Fast Play — lets you play a tape back about 25% faster than normal speed, to save time when listening to a tape.

Auto Stop — stops automatically when the tape reaches the end during recording and playback.

Automatic Level Control (ALC) Circuit

— automatically sets the recording level.

Power Options — let you power the re- corder from internal batteries, AC power (with an optional AC adapter), or vehicle battery power (with an optional DC adapt- er).

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Optimus - Katadyn Products Inc Micro-37 owner manual Automatic Level Control ALC Circuit