Feature:1. Accurate Temperature Control: Fish tank heater built in intelligent chip, accurate temperature control, safe and waterproof, fast heating.2. 26 Constant Temperature: Small submersible aquarium heater dynamic constant temperature to 26 , keep the water temperature constant. Even heating.3. Universal Use, Indicator: Fish tank heater fresh seawater universal. Green light 26 constant temperature, red light heating state.4. Quartz Glass: Small fish tank heating stick is made of premium quartz glass, high hardness, high temperature resistance, good chemical stability.5. Compact and Small: Submersible aquarium heater size is small and compact, does not occupy the fish tank space, practical and convenient.Specification:Item Type: Fish Tank HeaterMaterial: Quartz GlassSize:Length: Approx. 110mm/4.33in.Package List:1 x Fish Tank Heater1 x Suction CupNote:1. The heating rod must be used completely submerged, to ensure stable water circulation, not inserted or close to the bottom sand, affecting the heating rod heat dissipation;Fish tank water level heat will evaporate, you need to pay attention to the water level and add water on time to ensure that the heating rod is completely submerged, to prevent burning the rod body, melting the protective cover and other situations cause unnecessary trouble;Fish tank water change or need to take out the heating rod out of the water should be 15 minutes in advance of power off, cooling before taking out, to avoid improper use result in failure caused by unnecessary losses.2. Please allow some error in manual measurement.