"Up to 128 units work with one main controller.
Maximum 3 delegate units and 1 chairman unit can work at the same time.
With LCD windows in both main controller and speaking unit.
Built-in lithium battery. It supports 8 hours continuously speech or 25 hours standby.
Compatible with central controller.
One-Press-O , enable to switch o all activated unit from the controller.
Infrared ray transmitting ensures the con dentiality.
Anti-interference from RF signal and strong lighting application environment.
With camera tracking."
