The OWL DO2ST Dual OWL is a handheld light source featuring temperature compensated outputs. DO2ST arrives installed with the two most commonly used multimode wavelengths and has an easy to use two-button interface. High intensity LEDs such as the ones in OWL DO2ST Dual OWL light sources create intense beams of infrared energy that are invisible to the eye. NEVER LOOK INTO A LIGHT SOURCE OR THE END OF A FIBER THAT MAY BE ENERGIZED BY A SOURCE!