A laser beam generating device , comprising: a housing ; a laser light generator disposed in the housing and operable to generate a first output beam and a second output beam , the first output beam and the second output beam projecting outside of the housing ; wherein the laser light generator comprises a first laser diode which generates the first output beam and a second laser diode which generates the second output beam , configured such that when each one of the laser diodes is turned on, the laser diode is powered by pulse width modulation and the output beam comprises high and low pulses; wherein the laser light generator is configured to operate in a first mode in which the first output beam is projected outside of the housing and the second output beam is not projected outside of the housing ; wherein the laser light generator is configured to operate in a second mode in which the first output beam and the second output beam are both projected outside of the housing , and in the second mode at least a portion of the first output beam and the second output beam overlap outside of the housing ; wherein, in the first mode, the first output beam is operated at a first duty cycle and in the second mode the first output beam is operated at a second duty cycle, different than the first duty cycle; and wherein in the second mode, the first beam output and the second beam output have staggered duty cycles whereby when a pulse of the first beam is high a pulse of the second beam is low and whereby when the pulse of the first beam is low, the pulse of the second beam is high; characterized in that the laser beam generating device is a laser line generating device configured for construction layout tasks, the first output beam is visible and projects a horizontal laser line on a surface, the second output beam is visible and projects a vertical laser line or a dot on a surface, and in the second mode the first output beam and the second output beam intersect at a point on the surface. a housing ; a laser light generator disposed in the housing and operable to generate a first output beam and a second output beam , the first output beam and the second output beam projecting outside of the housing ; wherein the laser light generator comprises a first laser diode which generates the first output beam and a second laser diode which generates the second output beam , configured such that when each one of the laser diodes is turned on, the laser diode is powered by pulse width modulation and the output beam comprises high and low pulses; wherein the laser light generator is configured to operate in a first mode in which the first output beam is projected outside of the housing and the second output beam is not projected outside of the housing ; wherein the laser light generator is configured to operate in a second mode in which the first output beam and the second output beam are both projected outside of the housing , and in the second mode at least a portion of the first output beam and the second output beam overlap outside of the housing ; wherein, in the first mode, the first output beam is operated at a first duty cycle and in the second mode the first output beam is operated at a second duty cycle, different than the first duty cycle; and wherein in the second mode, the first beam output and the second beam output have staggered duty cycles whereby when a pulse of the first beam is high a pulse of the second beam is low and whereby when the pulse of the first beam is low, the pulse of the second beam is high; characterized in that the laser beam generating device is a laser line generating device configured for construction layout tasks, the first output beam is visible and projects a horizontal laser line on a surface, the second output beam is visible and projects a vertical laser line or a dot on a surface, and in the second mode the first output beam and the second output beam intersect at a point on the surface. <EOS>