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The product is activated by strong light in the same way as safety signs, once that light is removed the product will glo a green-white light. The glo is best observed in situations where light can be switched on and off - its performance in external situations where light slowly fades can be less marked.
This product is waterproof, however, responsibility to establish for suitability in aquaria rests with the purchaser.
Safety Information : Not suitable for children under 36 months without appropriate adult suprvision.