... following functions: conference discussion, voting/election/appraisal, auto track camera shot.3. Auto off selection: yes/no optional. 4. LCD ... 3-stage equalization, electronic volume, line switch, etc. 6.Full digital operation control, more convenient, accurate and stable. 7. ... , which offers more stable and reliable system operation. 9. Auto video tracking function, , built-in 4-channel video matrix ...