Momentary and constant-on Water-resistant Aluminum housing with black finish The ML300L offers momentary and constant-on operation, high, low, and eco modes, and an emergency strobe. The high output mode flashlight delivers 625 lumens of light for 16 hours, the low setting runs for 77 hours, and eco mode runs for 117 hours. You can arrange the switching sequence of these modes to suit your needs by selecting the General, Outdoor, Law Enforcement, or Military priority setting.