These are waterproof tea lights with a remote and they are great for anything bath, flower vase, pools and fish tanks if you can think of a place you can problably use them. They are reusuable and the batteries are easily changed. The batteries included in mine were fully charge just remember to remove the white disk or they will never work, I learned from experience. I had to give them 4 stars as there is a slight problem in the design, the sensor for the lights is hit or miss depending on the rotation of the floating light. Angling the remote does eventually work, so there is room for improvement. Lovely colors and good for mood lighting and parties (Drop them in a punch bowl, maybe.)
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https://www.amazon.co.uk/Submersible-Waterproof-Underwater-Decoration-batteries/dp/B07B8MX591