This Underwater Kinetics dive light beacon is the convenient solution to your night diving marker. This dive light features: Dive Light Beacon Made by Underwater Kinetics (UK) Always ON, no annoying flashing Optional white lamp (2 hr burn time) Specifications: Power: .075 watts (LED), 1.13 watt Lamp: Ultra high brightness red LED Burn Time: 24 hours (LED) Battery: 2x alkaline AAA-cells (included) Size: 0.75 diameter x 7.5" length Be seen at night by fellow divers and dive master with this dependable high visibility red personal marker beacon. Long burn time and high brightness make it a perfect chemical light stick replacement. Lanyard included for easy attachment to tank valve or BC. "