With a simple turn the rotary control switch gives you variable power, from 15% - 100% brightness.
The red power on LED indicator, located in the micro usb port will illuminate when the laser is turned on. It will also increase and decrease in brightness in conjunction with the power level of the laser.
The rotary control switch is a direct replacement for the standard SRX clicky switch and it is only compatible with the SRX single mode model
Once you have adjusted the power of the laser by rotating the control knob, the switch will memorise your power level. The power level will remain the same when you turn the laser off and back on again