It looks like an eyepiece.It can be easily inserted into eyepiece tube of microscope.The digital micro-image is immediately picked up by computer.It’s used in the field of image demonstration and analysis and application. USB is used to adapt with PC.Its is freely plugged and unplugged. High resolution CMOS chip supplies a nice image on PC monitor. Equiped with image driving software,and optional software: micro-image process software and senior micro-image analysis software. Another model VCE-1 Video Camera Eyepiece.It’s used on TV,supplies a nice image on TV set.