Mini USB Low Pressure Constant Temperature Heating Rod: Suitable for mini aquariums, aquariums less than 3L. Note: The heating rod must be completely submerged in the water when using it Electronic temperature regulation externally controlled: using intelligent frequency conversion technology. 3-digit display to accurately control the temperature, with a regulation accuracy of 0.5 ° C 1 °F Explosion-proof quartz glass, robust, corrosion resistant, automatic constant temperature, automatic shutdown over 36 ° C / 96 ° F Using the USB power plug, you can connect and use the power for mobile phone charging / mobile power, simple to use and easy to install
