... 1 multifunctional wireless presenter multfunctional 2.4G wireless mouse presenter ,Track ball presenter,Red laser pointer The trackball presenter has two ... and down ,switch screen .laser pointer ,mouse R key & L key and trackball(M2)close current window ,open my computer ... ,zoom in and out ,laser pointer .mouse R key & L key and trackballoptional memory :1GB,2GB,4GBand moreOperating System: Windows98 ...