Waterproof-- The wire parts of the string lights are fully sealed, thus making it submersible, but the battery case is only IP 65 waterproof, so it can meet normal use outside but not enough to put under water directly, feel free to put the wire parts with micro LEDs into your water fountain to create amazing water scene.
Battery operated string lights(NON PLUG-IN) -- Require 3 batteries for each strand; Fresh battery(not included) can last for up to 5 days with continuously STEADY ON Lighting, let along on flashing mode; with timer set for 6 hours on each day, they will last for more than half a month without problem.