Runs on 2 AAA batteries. Cradle is optional. Palm m105 - Everything the same as m100 except the m105 has 8 MB of memory. Both have infrared ports and HotSynch capability. Both have wireless software but not the accessories.
Wireless hardware is optional.
They're ready with Palm Mobile Connectivity software. Hook either up to a wireless modem or data-enabled mobile phone. The difference physical size is miniscule. 4.5 x 3.1 x .5 inches. Palm IIIe - Also 16MHz, 2MB of RAM, no flash and gray display.