【Dual Power Supply】 The Tally tamp can be powered by Micro-USB or 18650 li-ion battery，convenient for outdoor or Auditorium applications. Tally lamps can receive the tally signal transmitted from a video switcher with up to a 200m (line-of-sight) distance. 【2000 nit brightness】Both front and rear indicator on the lamps with 4-level adjustable brightness, the brightness up to 2000cd/m2, clear indication of the operating status of PTZ cameras in any location. 【Simpler and efficient】The tally system supports up to 16 tally lamps. both front and rear indicator lights on the tally lamps with 4-level brightness that can be adjusted. 1/4 inch hot shoe for tally lamp installation, Users can also check signal strength and power status easily 【Simplify audio and video production systems】 The tally box has RS232/RS485 port， Support remote PTZ camera control via RS-232/RS-485, compatible with Vmix and PTZ camera joystick controller, enables wireless control of PTZ cameras 【2-year Guarantee, lifetime technical support】 All machines are fully inspected at the factory to ensure that the product you receive is perfect. You have any questions during the purchase and use, please contact us directly, we will provide you with excellent after-sales service. 【What you can get】 You can get 1x tally box 4x tally lamps 1x 5V1A power adapter 1x USB2.0 type-C cable 1x antenna 1x GPIO connector (optional) AVMATRIX TS3019 is a wireless tally system,which is an auxiliary system that indicates the current broadcast position (red light) and the upcoming position (green light) of the camera operator, host and other related personnel through the tally indicator red and green, relaying information in real time.The wireless tally system suitable for interview programs,performances, sports, live weddings, churches and other livebroadcast activities.