1、Silver plated contacts, automatic power off over temperature. 2、Double seal head, safe, waterproof and anticreep. 3、Mechanical adjustment knob, 18-34 degrees wide range of high precision, meet the needs of different environments. 4、Nickel-chromium electric heating wire, heat accumulation quickly, more stable. 5、Stainless steel heating rod, high strength, explosion-proof, anti-collision, durable. 6、Lasting constant temperature, keep at set temperature. 7、With top working indicator light, clearly show the heating state, and adopts translucence top cover, indicator light is more conspicuous after light on. 8、With two strong rubber suction cup, strong suction, fix firmly, hard to fall off. Item type: Fish Tank Heating RodCondition: 100% brand newMaterial: stainless steel+ABSColor: As picture shown Type Length(cm/in) Temperature control range 50W 19/7.5 18-34° 100W 23/9.1 18-34° 200W 28/11 18-34° 300W 32/12.6 18-34° 500W 37/14.6 18-34° 1. The indicator lights up to indicate that it is heating. 2. When the heating rod is working, it is recommended to install a water circulation system to achieve a better balance of the fish tank temperature. 3. Do not use the heating rod in the sand, so as not to affect the temperature control. 4. Calculation method of fish tank water body (Aquarium length x aquarium width x water level height) CM=1000X2=? The result is the wattage of heating rod required 1 x Fish Tank Heating Rod 2 x Suction Cup