<b>The aquarium heater tube is made of heat-resistant quartz, excellent in explosion-proof. Works in intermittent operation mode, it provides a constant warm environment for your pet fish to stay healthy.</b><br> Double seal and protective sleeve design, preventing your pets being scalding.<br> Can be used in marine and fresh water environment.<br> Compact and light weight, easy to hide in the tank.<br> Temp exactness is within 2 degrees in Fahrenheit. <br> Come with a Digital Aquarium Thermometer to detect the water temp.<br> <br> <b>Package Includes: </b><br> 1 * Aquarium Heater, <br> 1 * Thermometer,<br> 1 * Detachable Shield,<br> 2 * Suction Cups, <br> 1 * User Manual<br> <br> <b>Features of the Aquarium thermometer:</b><br> LCD display with remote submersible sensor probe<br> Compact design with 2 suction cup mounts<br> Temperature Range: -58 °F to +158 °F (-50 °C to +70°C)<br> Resolution : 0.1°C<br> Accuracy : +/- 1°C<br> Switch between °C and °F<br> Powered by one LR44 button cell battery<br> Sensor probe cable length: Approx. 3 feet (1 meter)<br> <br> Note:<br> For better experience and safety, please carefully read and follow the user manual.<br> Keep the heater fully submerged in water. Don’t bury the heater in sand or mud.<br> Please don't plug in before the heater is well installed.<br> Stick the heater vertically or horizontally onto the tank side near the water intake or on the way of water flow.<br> Please disconnect power and wait for 15 MINUTES to cool down before you move the heater or change the water.