The Chemical Lightstick Alternative® Tired of throwing away chemical light sticks after every use? Our Mark-Lite is The Original battery operated submersible marker light. Use one in the dark in place of a chemical lightstick while scuba diving, camping, jogging or and biking. Every Mark-Lite features a reliable, twist-on switch and use 1 AA battery lasts hours—with an operating cost of less and 20 cents/hr. Save money while helping keep our environment and oceans clean. Available in your choice of four popular lens colors. A bungee lanyard is included.