No any chemicals, heat, etc. Just enough water, then it bring you an excellent mist effect. Colorless, non- andodorless. When is equiped with a LED powergenerator, the light shine with the out mist, adding cozyand romantics atmosphere for your fish tanks, rockery landscape, etc. (power adapter not included). Just put this floating mist machine in the pond or fish tanks, and plugs in the usb adapter, turn on thepower. Then here comes this floating mist atmosphere. The depth of water must be beyond8cm. Therefore, it can work effectively and properly. Suitable for mini pool, pond, fish tanks, rockery landscape, reptiles incubator and more occasion, etc., Manufacturer: Littimoon