Wouldn't you think a product whose title reads "with Dual Power Source" would actually include the AC adapter? Not in this case, although I can order one separately.
If you in fact want the AC adapter to arrive in the same package as your cassette recorder, be sure you order the Sony TCM-210DV, which I now understand is the model I should have ordered. The TCM-210DV appears to be identical to the TCM-200DV but includes the AC adapter.
Although I don't have the AC adapter I wanted as insurance for the occasions on which I record on tape, the recorder performs just fine on battery. I use it primarily to play audiobooks from the public library, because a Walkman or other play-only motor is not powerful enough for old, worn cassettes.
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Sony TCM-200DV Standard Cassette Voice RecorderProduct Description: Sony's TCM-200DV cassette recorder offers a multitude of features which make it an excellent choice for a cassette voice recorder. The two channel, one track recorder promises accurate recording. For recording ease, Sony has installed double recording time and voice operated recording. The double recording time gives you the option of recording at a standard speed, or at half the standard speed, essentially giving you double the recording space. With voice operated record, you no longer have to worry about constantly shutting off and switching on the record button; with the first hint of sound, the TCM-200DV will begin recording. Sony's Sony-Matic automatic recording level control will keep your recordings at one constant level. Play-back editing or transcribing becomes more useful with this feature. If the internal microphone doesn't support your recording needs, simply plug in an external mic into the mic jack.
An essential playback feature is the playback speed control. With this adjustment, you can adjust the speed between thirty percent of normal and negative fifteen percent of normal. This is a great tool for those transferring interviews or lectures. If you find yourself fighting to hear the cassette player via the built-in speaker, plug earphones into the recorder and your troubles will be lessened. In fact, Sony has installed a L/R monaural earphone jack for clear and unobstructed hearing.
There are two options in powering this recorder. The first is an optional AC adaptor. If batteries are more useful, use the required two AA batteries; these batteries will run for up to twenty-five hours. With the LED battery level indicator you can be watchful of remaining battery time. With automatic shut-off, you can be assured that you will not be wasting batteries needlessly.
Other features include: clear voice recording system, cue and review, pause switch, stop/pause release function. The recorder's color is silver.
What's in the Box Sony TCM-200DV cassette recorder and user's manual.
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This product is used educationally.It is light but rugged; a nice color blue.The sound of the recordings is a good quality.
A genuine throw back to the 1970's, the RQ-2102 is a quality portable recorder. Using 4 D cells or AC, this is a heavy unit by today's standards. Features old fashion slide in or out plastic carrying handle. If you need a rugged unit that will be used on a table and need to do a lot of recording or playback this would be a better choice than Panasonic's mini cassette recorder such as the RQ-L31 which is also an excellent cassette recorder. Unlike the mini cassette recorders this model will fast forward and rewind faster. The buttons feel solid so when you push you get a good response. Has an excellent pause control by releasing the capstan and pinch roller from the cassette removing that awful low whine found in mini cassette recorders. Has que, review and tape counter and can use external microphone or earphones. Larger speaker provide better and fuller sound. This is the last and best of Panasonic's shoebox style units so if you like this 1970's style recorder get this and you won't be disappointed.
I've had one of these since 1993. It's perfect. It's a tape player and recorder, and that's it. 
The Sony TCM-150 is about the cheapest cassette recorder on the market at this time.For five to ten bucks more you get voice activation, an external microphone jack, a tape counter, and extended play/record.The models with these features are the Sony TCM-200DV (without the tape counter) and the Panasonic RQ-L31.Of course, in all these cases, you're getting a cheaply made recorder intended for lectures, notes and inteviews.If you want something for music or that's built to take some punishment you'll have to pay more.