... ambient light, which greatly reduced power consumption)AA alkaline and AC adapter for power supplyLow battery indicationSpecifications Model3508Operating wavelength(nm)1310/1550 ... Package MODELINCLUDESAll 31163116 Optical Light Source, 3pcs 1.5V batteries, AC Adaptor, UserModelsManual, Cotton swabs and Soft carrying case Handheld Adjustable ...