<p><b>Dear friends, our heaters have passed the most rigorous tests before leaving the factory. If there are any quality problems, you can get a new heater or a full refund for free. Please rest assured to buy. We guarantee that you are satisfied with our products.</b></p> <p>You will need an aquarium heater to keep your tank in a steady and controlled temperature, as proper temperature range is very important to fish and other Aquatic in winter.</p> <p>Our aquarium heater help your fish and other aquatic keeping away from stress and diseases by providing proper temperature.</p> <p></p> <p><b>Features</b></p> <p>1, The aquarium heater is provided with an extra thermometer to show the accurate tank temperature to avoid overheat or freeze.</p> <p>2, The aquarium heater is operating as a staged heating, once achieved the setting temperature, it will stop heating for a while, and then continue working to maintain the temperature.</p> <p>3, Easy to set and adjust to the setting temperature with the use of the temperature adjustment knob, offers simple installation.</p> <p>4,Strong suction cup TIGHTLY FIX the heater to the tank.</p> <p></p> <p><b>Notices</b></p> <p>1, Before powering, make sure the heater is completely submerged in the water.</p> <p>2, Before removing the heater out from the water, make sure the heater is unplugged to avoid dry heating.</p> <p>3, Please NOT put the aquarium heater into the sand as this will cause INACCURATE heating.</p> <p></p> <p><b>Specification</b></p> <p>Power: 500W /300W /200W /100W</p> <p>Voltage: 110V-120V,50-60HZ</p> <p><b>Package Include</b></p> <p>1* Submersible Aquarium Heater</p> <p>1*Heater protecter(with sucker)</p> <p>1* Thermometer(with battery)</p> <p></p> <p></p> <p></p> <p></p> <p></p> <p></p> <p></p> <p></p> <p></p> <p></p> <p></p> <p> </p> <p></p> <p></p> <p></p> <p></p> <p> </p>