9 Air traffic control radio equipment; Audio-video receivers; Audio amplifiers; Audio equipment for vehicles, namely, stereos, speakers, amplifiers, equalizers, crossovers and speaker housings; Camera tripods; Digital audio and video recorders and players; Downloadable mobile applications for recording field and crop observations related to pest pressure, tracking field conditions with GPS-enabled maps, and generating crop scouting reports; Earphones; Electronic monitors to collect operational data and settings, including temperature data and settings, from HVAC equipment to ensure proper functioning; MP4 players; Music headphones; Recording and playing devices for sound and image carriers; Satellite dishes for satellite transmissions; Transmitters and receivers for audio and video signals for transmission over twisted pair cables; Video multiplexers; Wireless communication devices for voice, data or image transmission; Matrix switchers for audio and video signals