Series 4

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Computer Ease
Series 4
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Notes:

Estimated hours of battery power in hours, where high memory models seem to require more power; actual hours will of course vary according to use, sound volume, backlight use, AC adapter use, saving to memory cards, etc.
AC adapter for the Series 3, 3a, 3c, and 3mx outputs 9v DC. The Series 5 adapter outputs 6v DC. The Revo uses a different type again. The Series 7 may also use a different type. Polarity is reversed between some machines. Do not interchange!
The Revo and Series 7 can be charged by their synchronization cradles.
The 3c and 3mx have an additional application button for Jotter program.
Series 5 and 5mx have 9 off-screen application quick access buttons and 5 command buttons to the left of the screen.
The Revo Nickel Metal Hydride (NiMH) batteries are AAA form and rechargeable but are not user serviceable.
The 3c (b) is the Series 3c backlit model, first introduced in North America.
The 3a (512) is an early generation Series 3a with 512KB RAM.