Description:  CP-27B Optical Chart Projector Eyesight Vision Visual Tester Software Remote Control    Features:   The products can be installed on the personal computer with the LCD screen 14''、17''、19''、 it is combined with a installation CD、a USB dog、and a romote control、 after we install the software on the computer、 and plug into the USB watchdog and the remote control receiver、 then we can operate the software easily by the remote control and change the charts conveniently. Vision Testing Software Compatible with Win XP、 Win 7、 Win 8 system.   Specifications:   1.Charts includes: E Snellen、 C Landolt、 ABC letters、 Numbers、 Children、 Astigmatism、 Achromatopsia、 Synthesis、 Ophthalmic pictures; 2.Distance adjustable: 6.3m、 5m、 4m、 3m、 2.5m、 2m、 1.5m、 1.2m、 1m 3.Dimension:21.7(L) x 17.7(w) x 4.2(H)cm 4.Weight: 0.5kg          Packge included:  1 x USB watch dog 1 x Remote Control  1 x Standard Ruler  1 x Installation CD  1 x English Users Manual   Details pictures: