The Maglite ML125 LED Flashlight with NiMH Rechargeable Battery Pack is an LED light that runs on either the included NiMH rechargeable battery pack or 3 optional C-Cell alkaline batteries (not included). The ML125 is constructed from durable anodized aluminum, making it weather- and corrosion-resistant. The flashlight includes 4 sets of user-configurable functions: In Set 1, click once for Full Power, twice for Power Save (25% power), and three times for Strobe (12 flashes / sec) mode. In Set 2, click once for Full Power, twice for Power Save, and three times for SOS Signal / Morse Code. In Set 3, click once for Momentary mode, twice for Full Power, and three times for Power Save. In Set 4, click once for Momentary mode, twice for Full Power, and three times for Strobe.