Quality: These waterproof tea lights are made of acrylic which seals the battery and LED bulb from becoming wet, thus making this light completely waterproof. These have been tested in large bodies of water and will remain lit even when submerged for a long period of time. Uses: Led Submersible Tea Lights add a decorative touch to your wedding centerpieces, party dcor, birthday flower vases, floral arrangements, fish tanks, ponds and pools. These soft LED Tea lights create a warm ambiance without the smoke, wax or mess to clean. Packaging & Operation: These submersible lights come packaged in packs of 12. The attractive packaging makes this a great gift item. Each light uses 2 batteries ( CR2032) which can be replaced (replacement batteries NOT included) so you can reuse these tea lights as many times as you wish. LED bulbs are known to be really long lasting. Each light can easily be operated by twisting them on/off. PRIOR TO USE: unscrew each light to remove plastic battery protector tab. Safety: Waterproof LED lights submersible are known to be the safest of lights on the market today because it is cool to the touch. These lights specifically meet high safety standards since they are made to use under-water as well as on dry surface. Extra-Long Burn Time These submersible LED lights will provide approximately 48 hours of continuous bright white light. However, it will not die completely until it reaches approximately 64 hours of burn time. The light will just become dimmer between the 48-64 hours. This makes these lights the longest burning submersible tea lights on the market today (can burn almost 3 consecutive days.)