This is supervisory communications systems work directing a crew of full performance Communications Technicians or supervisory audio-visual systems work directing a staff of Audio Visual Technicians engaged in the operation, maintenance, installation and repair of communications or audio-visual systems and related equipment. An employee in this class participates with subordinates in more complex and difficult assignments. An employee in the Audio-Visual Services specialty supervises the operation and maintenance of audio-visual devices and security systems at the Free Library. This employee receives work requests, prioritizes assignments, delegates and reviews work, and reports on all progress. The employee in the Communications Specialty is on call 24 hours a day in the event of an emergency situation. Work is performed under the general supervision of an administrative superior, involves some disagreeable working conditions and requires light physical effort.