Cerevo announces the global availability of "FlexTally", a wireless tally lamp system | Cerevo Global
Tally light - Wikipedia
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Amazon.com : Cerevo FlexTally Tally Light System for Multi-Camera Setup - 433MHz Wireless or Serial Connection - 1 Station Connects to Video Switchers and 4 Lamp Units Connect to Each Camera : Electronics
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Amazon.com: Cerevo FlexTally Wireless Tally Set in Bag switcher Tally lamp on air lamp Studio Camera for Live Shooting cue lamp Video Mixer Video switcher Video switcher for Live Streaming : Sports