Features:

• 【For Fish Tank 30-60 gallon】300W aquarium heater, voltage AC 110-120V, power cord is 5.0ft, please choose the right wattage aquarium heater according to our size chart. Comes with detachable shield and 2 suction cups. It's easy to hide it in the tank (acrylic or glass).
• TEMP ADJUSTABLE: Temperature can be adjusted between 68-94℉. You can set the temp to one of these values on the dial: 68, 71, 75, 78, 82, 86, 90, 94 by rotating the pointer, which allows for complete control of aquatic climate within a 2-degree difference.
• SAFETY PROTECTION: Effectively maintain the tank water in the constant temp you set, stop heating when the water temp is 1.5-2℉ above the set temp and restart heating when the water temp is 1.5-2℉ below the set temp.
• BLAST-PROOF: Made of shock resistant quartz glass, covered with double sealed case, explosion-proof and no electricity leakage, preventing your pets being scalding. Can be used in fresh water and salt water aquariums.
• BUY ONE GET ONE IN FREE: This fish tank heater come with an extra thermometer to show the accurate tank temperature to avoid overheat or freeze. It provide a constant warm environment for your pet fish to stay healthy.

Details:

The aquarium heater tube is made of heat-resistant quartz, excellent in explosion-proof. Works in intermittent operation mode, it provides a constant warm environment for your pet fish to stay healthy.

Double seal and protective sleeve design, preventing your pets being scalding.
Can be used in marine and fresh water environment.
Compact and light weight, easy to hide in the tank.
Temp exactness is within 2 degrees in Fahrenheit.
Come with a Digital Aquarium Thermometer to detect the water temp.

Package Includes:
1 * Aquarium Heater,
1 * Thermometer,
1 * Detachable Shield,
2 * Suction Cups,
1 * User Manual

Features of the Aquarium thermometer:

LCD display with remote submersible sensor probe
Compact design with 2 suction cup mounts
Temperature Range: -58 °F to +158 °F (-50 °C to +70°C)
Resolution : 0.1°C
Accuracy : +/- 1°C
Switch between °C and °F
Powered by one LR44 button cell battery
Sensor probe cable length: Approx. 3 feet (1 meter)

Note:

For better experience and safety, please carefully read and follow the user manual.
Keep the heater fully submerged in water. Don't bury the heater in sand or mud.
Please don't plug in before the heater is well installed.
Stick the heater vertically or horizontally onto the tank side near the water intake or on the way of water flow.
Please disconnect power and wait for 15 MINUTES to cool down before you move the heater or change the water.