Features: 1. High quality electric resistance wire, uniform heating, durable and long service life. 2. Double layer waterproof insulation, can control water temperature, easy to adjust and read the temperature. 3. Power indicator lights up means the heater is starting to work, when the water temperature reaches the specified temperature, power indicator will automatically turn off. 4. High resistance heating wire, double waterproof protection, long heating life. 5. Equipped with 2 powerful suction cups, reinforce the heating rod to prevent from falling. Specification: Condition:100% Brand New Item Type: Aquarium Water Heater Model: HX-906 Material: ABS Color: As Pictures Shown Power Size(mm/inch) Aquarium Size(cm/inch) 25W 197x23/7.76x0.91 Below 20/7.87 50W 197x23/7.76x0.91 20-35/7.87-13.78 100W 230x23/9.06x0.91 35-60/13.78-23.62 200W 280x23/11.02x0.91 60-80/23.62-31.50 300W 312x23/12.28x0.91 80-100/31.50-39.37 Install and Use: 2. Place the heating rod in water and electrify it in the following position: completamente submersible, part submersible, put across at cylinder bottom. Packing List: 1 x Aquarium Water Heater 2 x Suction Cup Bracket .