Adjustable Aquarium Heater Thermostat 25-300w 110-220v Fish Tank Temperature. Transform Your Aquarium into a Thriving Ecosystem with Our State-of-the-art Aquarium Heater, Engineered for Precise Temperature Control in Both Freshwater and Marine Environments. Crafted from Robust, Explosion-proof Quartz Glass, This Heater Ensures Safety and Dependability, Even Under Tough Conditions. Its Intuitive Design Makes Installation Effortless for Aquarists of Any Experience Level. Featuring a Sensitive Temperature Regulator and Integrated Over-temperature Protection, This Heater Consistently Maintains Your Preferred Tank Temperature. The High-resistance Heating Wire and Fully Submersible Design Offer Precision and Durability, Supported by Dual Waterproof Protection. Installation is Simple with a Sturdy Support Hook and Suction Cup for Secure Placement. This Adaptable Heater Fits Various Aquarium Sizes, Offering Power Options from 100W to 500W and Can Be Submerged Up to 120 Cm, Accommodating Diverse Aquatic Habitats. Features: - Adjustable Temperature Range: 20°C to 34°C - Durable Explosion-Proof Quartz Glass - Sensitive Temperature Regulator with Over-Temperature Protection - Fully Submersible for Freshwater and Marine Use - Strong Support Hook and Suction Cup for Easy Installation - Available Power Options: 100W, 200W, 300W, 500W - Voltage: 220V-240V - Frequency: 50Hz-60Hz.