The Tac Eos headlamp ispact military tough and is housed in an ultra light polymer body. Uses 3 x AAA Alkaline or Lithium batteries. The Tac Eos also has an easy-to-change lens filter system designed for specific nighttime activities: red for preserving night vision blue for blood tracking and green for hunter safety. Each has four output modes the strongest of which can shine the 1 watt Maxbright LED a staggering 56m. The Tac Eos strong stealthy state-of-the-art.ATTRIBUTES Batteries Included: Yes Bulb: LED Burn Time: 121 Hours Carry System: Head Strap Finish: Black Material: Zytel Output (lumens): 48 Power Source: AAA x 3 Special Features: 4 Modes Blue Red and Green Lenses Submersible: 1 Meter Switch: Push Button On/Off/Modes