The Laser Sys*Stim™ 540 The Mettler Electronics Laser Sys*Stim™ comes with a 785 nm laser probe with visible blue LEDs that illuminate the treatment field. An optional SLD/LED cluster probe with 950 nm SLDs and 660 nm LEDs is also available. The Laser Sys*Stim allows the clinician to set treatment time, continuous/pulse modulation modes and laser output energy. All treatment parameters are displayed on the LED displays and controlled via the membrane keypad. There are holders integrated into the unit to store applicators when not in use. Laser output can also be adjusted via controls on the both laser and cluster applicators.