Seaoura SR-317 Submersible Aquarium Heater

About Item DOUBLE ALARM & SAFETY SHUTOFF: The SEAOURA Fish Tank Heater features over-temperature protection. When the water temperature exceeds the safe temperature you set, or the heater or temperature probe is exposed to air (such as during water change), it will automatically stop heating and activate an alarm sound to remind you to check the tank in time. 100W -300W heater length 10.4 IN, power cord length 37.4+59 IN, temperature sensor cord length 19.68 IN. 500W heater length 13.58 IN, power cord length 37.4+59 IN, temperature sensor cord length 19.68 IN.   TEMPERATURE PROBE AND EXTERNAL CONTROLLER: The temperature probe wire is directly connected to the heating rod, which can measure the temperature of more areas in the fish tank. And real-time monitoring of water temperature can prevent over/under temperature in the aquarium, no need to buy additional aquarium thermometer. External controller to set the temperature, safer and more convenient. Suction cups can fix the he