50W AQUARIUM HEATER 100% SAFE - Made of high quality quartz glass, Waterproof double seal material , black protective container, shatter-resistant construction, ensures safe operation and keep your fishes from scalding and punching Heater? is safe to use on larger fish tanks and aquariums ADJUSTABLE FISH TANK HEATER ADJUSTABLE TEMPERATURE - Only need turn the knob on the top of the , You can easily get the temperature you want?68 to 93°F) and read the temperature you set by the dial of the . Thermostat system to ensure that your beloved fish can be happy and comfortable life SAFETY PROTECTION - Built-in intelligent temperature chip control circuit; can automatically control the temperature. It will automatically turn off as the temperature rises above the internal setting you choose, and turns back on like a clockwork once it sufficientlly cools down?Due to some unpredictable external factors; it's normal that the temperature difference is ± 3°C / ±6°F? SUBMERSIBLE AQUARIUM HEATER - 50-watt, length: 9.8in", tank capacity: 5-15gal, voltage: 110-120v 60hz ALL THE PRODUCTS PURCHASED from our company are, guaranteed 180 days. If the quality problem occurs within the warranty period, our company will replace it for free.