Uelfbaby Aquarium Heater High-Performance 200W,300W with Temperature Digital Display. Temperature Digital Display: The Uelfbaby aquarium heater has the temperature display function, let you know the temperature inside the fish tank or tropical aquarium clearly Precise Temperature Control: The aquarium heater is controlled by a smart chip. The temperature range and set temperature are more accurate and will not be too high or too low High Temperature Protection: Built-in high temperature protection chip, when the temperature exceeds 36 degrees, the heater will stop heating. Prevent too high temperatures to make fish uncomfortable Water Protection: The top of aquarium heart with inductive probe, when the water level is lower than the probe, the aquarium heart will turn off, solve the problem of product damage caused by irregular use 100% RISK FREE PURCHASE: SATISFACTION GUARANTEED: If you have any problems about the aquarium heater, please contact us, we offer 24-Hour Customer Support, 30-Day Money Back and 1-Year Warranty. 1.Double setting switch and Temperature "C"&"F" for choices Both internal and external thermolator available for easy operation 2.Digital number show the aquarium heater has the temperature display function, let you know the temperature inside the fish tank for tropical aquarium clearly 3. Lack of water protection function, intelligent detection function and other powerful 4.Product quality confirms European CE standards. 5.Fine packaging, very good protection Attentions： Please use the product in the water, when product is exposed in the air, the after-heat may cause damage to the heater or finally make it broke. After you have cut the power please wait at least 20mins until you can put it out. The product can apply to both fresh water and seawater, but please do not use the product in corrosive environment. Install： You can set the product both vertically and horizontally but please put all the product inside the water.