Features: Preset Temperature: Mini 25W Aquarium Heater For Fish Tank Will Automatically Keep The Water Temperature Constant At 78 Compact Size: The Small Aquarium Heater Can Easily Meet Your Need, No Matter How Small Your Fish Tank Is Safe: Unlike Traditional Plastic Seals, The Turtle Water Heater Uses A Rubber Sealing Layer For Better Sealing And Safety Performance, And Will Never Leak Electricity Or Water Durable: Quartz Glass Material, Explosion-Proof And Crack-Proof, More Sturdy And Durable, Without Worrying About Damage Specifications: Model: Aquarium Heater 5 Gallon Power: 25W Voltage: 110-120V60Hz Heater Size: 45*10*10 Inch Cable Length: 39Ft Application: 1 To 5 Gallon Package Includes: 1*Aquarium Heater 1*Thermometer Sticker 1*Suction Cup Maintenance: This 5 Gallon Fish Tank Heater Is Free Maintenance Item, For The Good Of Heater Function And Service Life, We Suggest: Check The 5 Gallon Aquarium Heater Working Status Regularly, If Any Strange Signs, Please Plug Off Immediately Clean The Fish Tank Heater 5 Gallon Suction Cup Regularly (3 Months) With 140 Warm Water And Soak It For A While If You Found Any Soil Or Moss Things Covered On The Fish Tank Heater 3 Gallon, Please Plug Off The Heater And Clean It With Fresh Water After A Few Minutes Later, Especially The Heating Part Stains Do Not Use Any Other Liquid To Clean The Fish Tank Water Heater, It May Damage The 5 Gallon Tank Heater Cautions: 1 The Heating Part Must Be Fully Submerged In The Water To Avoid Dry-Burning, Otherwise Will Cause Damage To Small Fish Tank Heater 2 If You Need To Change The Water, Please Turn Off The Power, Let The Heater Cool Down For More Than 20 Minutes, Wait For It To Cool Down Completely Before Taking It Out