Variable intensity, interconnectivity and master control of all make these the "top of the line" markers.
The new advanced stage marker will save you lots of time and trouble. Each unit comes with three interchangeable LEDs: red, green, and orange. Optional blue LEDs are also available. With only one unit, you can have any color you like--just change the LED!
They are dimmable from either the individual unit or from a master control card when the units are daisy-chained together by standard telephone line. Each unit has a built-in on/off switch or a group can be switched on/off at the master card.
Each stage marker is powered by its own 9 volt battery. They are about the size of a standard Motorola pager so you can see they aren't very big.