by Blue Nomad, customized for the Dana's wider screen. Up to eight Alphawrite documents can be resident at one time, each instantly accessible via the Dana's eight function keys. Any number of Alphawrite documents are accessible via the File menu, up to the limit of the computer's memory. Also, it is a simple matter to switch between the Alphawrite documents and any of the four built-in apps native to Palm OS (Memo Pad, Datebook, Todo, Address Book). The screen is physically taller than that of the original AlphaSmart products, and the Dana's casing is made from opaque dark-blue plastic—a change from the iMac-esque clear blue of the AlphaSmart 3000. It uses either a Ni-MH rechargeable battery or 3 AA batteries for up to 25 hours of usage. Its AC adapter is rated at 7.5 VDC, center negative, 1000 mA. Danas produced near the end of its production run were modified because many users complained that their Danas were frequently turning themselves on when carried in a container, such as a backpack, depleting the battery charge. This was because the on-off switch was getting depressed and switching the device on. Version 1.5 of the Dana OS provided a way to require both the Enter and On/Off keys to power it up, making it less likely that both keys would be depressed accidentally. This is accessed through the system Keyboard App. The Dana has an IrDA compatible infrared port for transferring (or "beaming") documents and files. This is a convenient way to back up files to another Dana or an IrDA equipped PC. Being a Palm OS computer, files may be transferred to or from a PC over the USB port using the Hotsync feature of the included Palm Desktop software. This is also how third-party programs are loaded into the Dana. Another use for the USB port is to trickle-charge a rechargeable battery pack, in lieu of the AC adapter. Dana Wireless One year later, in 2003, AlphaSmart added the Dana Wireless model (FCC ID KV2DANA002) which added built-in Wi-Fi connectivity for internet use & interaction with other Danas, doubled the RAM capacity from 8 MiB to 16 MiB, doubled flash ROM from 4 MiB to 8 MiB, quadrupled the number of shades of gray displayed from 4 to 16, and added SDIO support to the SD card slots. It used 3 AA batteries (standard or Ni-MH or Ni-Cad) for up