The LERMITY 500w Aquarium Heater Fish Tank Auto Thermostat with LED Digital Temperature Readout and External Temperature Controller for Salt Water and Fresh Water (Titanium) is a high-quality, durable product that is perfect for keeping your fish tank warm and comfortable. The thermostat features two probes that ensure accurate temperature detection, and the external temperature controller helps you adjust the temperature outside the fish tank easily. The durable suction cups keep the heater in place, and the thermostat is easy to install without any tools.