Preparations Before Use Submerge Pump Inlet: Before using this product, the pump inlet must be fully submerged in clean, fresh water. This step is crucial as it ensures there is sufficient water inside the product for circulation, thus preventing dry-burning. Check Water Level: that the water level reaches the recommended safe water line specified in the product manual. An insufficient water level may cause the product to malfunction or even pose a safety hazard. Colour:As Shown Material:PC Operating Instructions Avoid Dry-Burning:Never start or use this product without water under any circumstances.Dry-burning can not only damage the product but also lead to serious safety accidents such as fires. Regular Inspection:Regularly check the power cord,plug,water inlet,and internal components of the product for any damage.If any abnormalities or damage are found,immediately stop using it. Proper Placement:When using this product,place it on a stable and keep it out of the reach of children. Disconnect Power:When not using this product,please unplug the power cord to it is completely powered off. Burnout Risk:Using this product without water cause the internal components to overheat,leading to burnout. Please note that: It needs to be used with a charging with an output power of 12V2.5A or higher,with 4 temperature adjustment levels,with the maximum level being the first level and the being the temperature control level. The size of the water capacity affect the cooling effect,and it is recommended to use a water tank with a capacity of more than 3L Please read the following safety warnings and operating instructions carefully before use and comply with them strictly. Due to different product batches,the appearance ,which does not affect the use Package Contents: 1 * Temperature Controller 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.