Smelly Jelly scented water crystals are a great way to add a little fragrance anywhere a candle may not be practical. The vented lid releases a lovely fragrance into your room. They do not require a heat source. They are perfect for dorm rooms, retirement centers, the office, the bathroom, etc. Place the jar on a candle warmer for an even stronger scent throw! When the scent starts to fade, simply add a teaspoon of distilled water, stir and they're good to go again!