The LED submersible tea light is exactly what it says, submersible. You can immerse it in water for those applications where water is being used. Even better, you can replace the batteries and use it over and over. Battery life is up to 48 hours on one set of batteries. Available in 9 great color choices, you are sure to find a combination that will enhance your design creating that Wow! reaction. The on/off switch is accomplished by screwing the light down tight, creating a water proof seal and un-screwing to turn it off.