Features: - This item is to keep the water temperature steady. Its design is anti-rust， useful and durable.- Made of shock resistant and shatter proof quartz for fresh or marine water.- Suitable for fresh water， seawater.- Please pay attention for the suckers installation position before your want to install them.- The heating rod must be totally immerged into water and no exposure is allowed.- When the indicator light is on， it is working.- Before cleaning the aquarium or heating rod， please turn off the power for 15-20 minutes to cool off the heating rod， or you will be burned.- Safey control protects against running dry.- Will automatically turn off when water level dips too low.- The dial of heater controls precise temperature regulation.- Voltage: 220 - 240V 50 / 60Hz.- Wattage: 50W / 100W / 200W / 300W / 500W.- Temperature range : 16 - 34 Deg.C.- Cable length: 1.5 - 2m.- Diameter: 22mm. Internal Sensor Measurement Range: 0-40 Degree Celsius External Sensor Measurement Range: 0-99 Degree Celsius External Setting Range: 5-95 Degree Celsius(Factory settings: 50 degree celsius�� Package weight: 0.482 kg Package size (L x W x H): 48.4 x 8.1 x 5.5 cm / 19.02 x 3.18 x 2.16 inches Package Contents: 1 x HL-288 Adjustable Submersible Water Heater Blastproof Heating Rod for Aquarium Fish Tank， 1 x Protective Sleeve