Dear Juan,
Here is the comparison sheet between BrailleNote Classic, BrailleNote PK, and a BrailleNote mPower: Differences between Classic, PK, and the mPower follows (I'm going to describe in technical terms):

Technical specifications for BrailleNote Classic running KeySoft 7.2: Operating System: Windows CE 4.2 (KeySoft 7.2.47) Processor: MIPS r4000 clocked (running) at 100 mHz Memory: 16 MB RAM, 16 MB Flash (upgradable to 48 MB) Components and ports: serial (RS232), parallel, PC card slot, CompactFlash slot, 56k modem, InfraRed (IRDA) port, headphone jack Input: 9 key braille keyboard/QWERTY keyboard configuration Output: 18 or 32 cell braille display and/or single channel sound card (for speech only)
Speech: KeyNote Gold

Technical specifications for BrailleNote PK running KeySoft 7.2: Operating System: Windows CE 4.2 (KeySoft 7.2.47) Processor: Intel X-Scale PXA255 clocked at 400 mHz Memory: 64 MB RAM, 32 MB Flash (actually it is 40 MB RAM, 16 MB Flash) Components and ports: serial (proprietary), CompactFlash slot, Bluetooth tranceiver, headphone jack, internal microphone (with a Record button), USB client
Input: 9 key braille keyboard
Output: 18 cell braille display and/or multi-channel sound card (for listening to speech and a media file)
Speech: KeyNote Gold

Technical specifications for BrailleNote mPower running KeySoft 7.2: Operating System: Windows CE 4.2 (KeySoft 7.2.47) Processor: Intel X-Scale PXA272 clocked at 416 mHz
Memory: 64 MB RAM, 128 MB Flash
Components and ports: serial (RS232), PC card slot, CompactFlash slot, SD card slot, 56k modem, InfraRed (IRDA) port, headphone jack, internal microphone (with a Record button) and an external microphone jack, FM Radio chip, Bluetooth tranceiver, USB client and two USB host ports Input: 9 key braille keyboard/QWERTY keyboard configuration Output: 18 or 32 cell braille display and/or multi-channel sound card (for listening to speech and a media file; see note 1)
Speech: KeyNote Gold, Eloquence

Note 1: Actually, BrailleNote mPower has the true multi-channel sound card (I've managed to listen to four things at once: Eloquence, a media file, a recent recording, and the FM Radio at the same time). I hope this information may help you. If you have any questions, feel free to post them to the list!

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