Thickened quartz glass: 2 mm thickened quartz glass, 33% thicker than 1.5 mm normal glass aquarium heater, stronger and more durable.<br>[Easy Installation]:You can install it at any angle with 2 strong suction cups. Just make sure it is completely immersed in the water. We also supply 1 additional suction cup as replacement (total 3). We offer a 24-month warranty service.<br>[Even heat dissipation, more stable] The vertically distributed heating wire design can distribute heat evenly to the environment. This structure makes the heater more stable when heating. It should be noted that when using the heater, good water circulation in the aquarium must be ensured.<br>50 W aquarium heater for 15-50 L aquarium, length 18.5 cm, power cable 1.5 m. It can be used for fresh and sea water, heats automatically and keeps the aquarium at a constant temperature. The error between the actual water temperature and the set temperature is in the range of ±2 degrees. It is equipped with a sticker thermometer to detect the water temperature at any time.<br>[Adjustable and Easy to Use]:The adjustable temperature range of this aquarium heater is 20 to 34 C. After setting the temperature, it automatically turns on or off by detecting the water temperature to keep the water temperature at the set temperature without additional operation.