Hygger Quartz Aquarium Heater with IC Temp Controller provides a hospitable underwater environment for your fish to thrive.Features: IP68 100% Waterproof, Fully Submersible Dual Protection - Durable Quartz Tube, Shatterproof construction; Double sealed material and protective container for scald preventing and anti punching Accurate temperature control from 61°F to 90°F (16°C ~ 32°C) Easy to read blue LED digital display shows water temperature Ideal for used in freshwater and saltwater aquariumSpecification: Item name: Hygger Quartz Aquarium Heater with Temp ControllerModel: HG-925Voltage: 110V-120V, 60HZ Ground cord length: 4.9 ftAvailable In:200 Watt, Heat rod length: 6.3 inches, for 15~ 30 Gallon fish tank300 Watt, Heat rod length: 7.7 inches, for 30~60 Gallon fish tank500 Watt, Heat rod length: 10.4 inches, for 60~120 Gallon fish tankHow to set temperature: 1. Place heater rod and probe at the aquarium and keeps them both fully submerged 2. Plug in power and you can see the blue LED digital number display shows current water temperature and the red light indicator on 3. Press the set button to your desired temperature which will blink 3 seconds and starts to heat 4. Once it reaches the desired temperature, red indicator light turns in yellowWarm Tips: 1. Please read instructions and cautions of the package box carefully before use. 2. Always keep the heater rod and temperature probe fully submersible. 3. Before taking out the heater, please disconnect the power and wait for 10 MINUTES to cooling down.