Using these LED tealight candles is easy. First, make sure the battery is properly installed (a CR2032 battery is included for each light). To turn them on, simply place the candles in water so that the sensors on the bottom touch the water. They'll automatically light up and can stay lit for 12 - 16 hours. You can use them for various occasions like weddings, parties, or just to decorate your table or fish tank. Remember, the sale is only for the tea lights, so you'll need to provide your own decorative elements. When it comes to maintenance, once the battery runs out, replace it with a new CR2032 battery. Keep the candles dry when not in use to ensure their longevity.