Feature:<br> 1) FULL Submersible heater, made of shock resistant and shatter proof Titanium Alloy tube for fresh or salt water.<br> 2) Voltage AC 110-120V. Temperature can be adjusted between 20-34℃, 68-93F. You can press the 'SET' key to shift degree unit between Celsius and Fahrenheit<br> 3) On/Off indicator light for at-a-glance monitoring. Safety control protects against running dry <br> 4) The heater will automatically turn off when water level dips too low<br> 5) Aquarium heater with LED digital display, IP68. Control Accuracy: ±3°F<br> 6) The length of cable is 1.5 m/ 5 ft. Includes suction cups<br> <br> Note: <br> For better experience and safety, please carefully read and follow the user manual.<br> Don’t bury the heater in sand or mud.<br> Please don't plug in before the heater is well installed.<br> If you want to clean the fish tank or take out the heater, please disconnect power and wait for 30 MINUTES to cool down.<br> <br> Package included:<br> 1* Submersible Aquarium Heater<br> 2* Suction Cups<br> 1* User Manual<br><br>If Error code E1 is always showed on the display, the temperature probe on the top of heater may be blocked by small bubbles or excess water.<br> There are two kinds of solutions for your reference.<br> 1. Take out of the heater, shake the top of the rod to remove bubble or excess water in the probe.<br> 2. Reset the heater： <br> (1) Press and hold the set button<br> (2) The LED display will start to flash after the heater is power on<br> (3) Release the set button, and press the button again to set temperature.<br> (4) Take the top of the heater out of water<br> (5) After the LED screen stops flashing, press the set button again to keep the desired temperature.<br> <br> Any questions, please feel free to contact us. Our customer care team are always here to help you.