I bought this unit to replace a similar unit (different brand) that no longer works. I use it as a cassette deck in my cartridge by connecting its headphone output to the AUX input jack on my AM/FM CD audio system. I bought an inverter that fits in the cigarette lighter socket and has various voltage settings (specifically 3VDC to suit the needs of this unit) and soldered the wires to the respective positive and negative terminals in the unit's battery compartment. It works very well and allows me to play over 100 cassettes in my truck. (Note: you will need to purchase a patch cord with 1/8" stereo plugs on both ends to connect it like I did.)
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