These are the specifications of this reader, taken from Wikipedia:
Screen
* 6 inch (4:3)
* 800×600 (167 ppi density)
* SiPix
* 16 levels of grayscale
* touchscreen
CPU
* Samsung 2416 ARM9 400MHz
OS
* Linux 2.6.23
Memory
* 128 MB (MDDR)
* 2 GB (NAND)
* External microSD/microSDHC (up to 16 GB)
Connectivity
* Wi-Fi b/g
* microUSB high speed
* audio jack
Miscellaneous
* 1530 mAh, 3.7 V
* 240 gram
* Reading mode
* 10.000 pages (Wi-Fi off)
* 3.000 pages (Wi-Fi on)
* Stand by mode: 700 hours
The battery time is a very high estimate. The specs may vary a little from model to another (the number of buttons is different, there is space for a SIMCard, but I haven't found one with it).
The website of 4fff (Four Fou, I believe it is spoken), the manufacturer (in chinese):
http://www.4fff.com/product_detail-0-110.aspx