[Easy to Install] There are two sturdy suction cups on the back of the heater to fix it horizontally or vertically to the glass aquarium, ensuring smooth operation of the heater in the aquarium.
[Precautions for use] Please note: Submersible fish tank heater must be fully immersed in water, exposure to air may cause loss of temperature control, and do not bury them in sand or mud. Please do not place the controller in the aquarium, the controller is not waterproof. Also, please place the heater close to the water flow area to prevent uneven heating. Please unplug the power supply when cleaning the tank or changing the water in the aquarium.