Glo-Toob 3-Cap Pack All Caps Are For Use with the Standard Glo-Toob, Infrared Glo-Toob, and the FX Glo-Toob Includes a Push Button Cap, a Scuba Cap, and a Twist On/Off Waterproof Cap Push Button Cap: Designed for Use Above Water Only. Push Button Design Activates On/Off Mode and Cycles Through Output Levels on Infrared and FX Models. Includes an Extra Strength Stainless Steel Ring. Scuba Cap: Makes the Glo-Toob Waterproof to 11,500 Feet (3,500 Meters). Twist On/Off Design Only Allows for Constant On/Off Mode. Includes an Extra Strength Stainless Steel Ring. Recommended Cap for Scuba Diving. Twist Waterproof Cap: Makes the Glo-Toob Waterproof to 11,500 Feet (3,500 Meters). Twist On/Off Design Only Allows for Constant On/Off Mode. Manufacturer Recommends Twisting On/Off Underwater Only to Prevent Accidental Flooding