... Configured with built-in lithium battery for 3-4 hours working, Software is easy operating, Win 7 System and USB transmission. Specification for ... : rare wave, dense wave, alternative wave (2) Pictures (Configured with Pattern reversal stimulator)a) Pattern mode: checkerboard, vertical grid, bar ... gridb) Image Size: 64*32, 32*24, 16*12, 8*6, 4*4.c) Vision: full vision ...