... gray scale 3.Strong battery 4.Observing and listening,easy to read 5.Linux OS CPU Freescale ... gray scaleMaximum support RAM 256M SD 8GBattery Four 5# AA batteriesBattery life up to 28 hoursCharge ... LinuxDimensions 154mm*110mm*13.5mmWeight 168g(without battery)Support Formats EBA,EBAML,TXT,PDF,BMP,JPG ... ,XEB,GIF,Animated GIF,MP3,PNG,Founder's new format CEBConnect USBSpeech Technology support txt, ...