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. No any chemicals, heat, etc. Just enough water, then it bring you an excellent mist effect. Colorless, non- andodorless. The depth of water must be beyond8cm. Therefore, it can work effectively and properly. 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). Suitable for mini pool, pond, fish tanks, rockery landscape, reptiles incubator and more occasion, etc. Applicable area: less than 10 square meter Water tanks capacity: more than 10 liters Number of fog outlets: 1 Noise: below 36dB RatedVoltage: 220V Colour: Black Material: Plastic Size: Floating Rings Diameter: .10cm/3.93inch Overall Height: .13.3cm/5.23inch Combination Size: .10x10x10x13.3cm/3.93x3.93x3.93x5.23inch Package Contents: 3 x Humidifier Generators Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.