Mesee USB Mini Aquarium Heater, 15W Small Fish Tank Heater with External Temperature Controller Adjustable Betta Heater Submersible Thermostat Heater USB Powered Small Fish Bowl Heater for 1-4L Tanks

Mini Aquarium Heater - Compact & submersible design to take less space and hide in the fish tank, designed for most mini fish tanks up to 1-4 liters such as fresh water, seawater fish tanks, pet feeders, etc.

Quartz Glass Fish Tank Heating Rod - Strong and corrosion-resistant, explosion-proof, high-temperature resistant protective cover will not soften with high temperature, it can prevent your loved fish from scalding.

External Temperature Controller - Accurately adjust the temperature from 64 to 93°F(18-34°C) via the external controller without immersing your hands in water to rotate the dial, LCD display controller can quickly and clearly show the temperature change.

Automatic Constant Temperature - Water temperature can be kept constant with an accuracy of 1°F. This fish tank heater will automatically stop heating when the water temperature exceeds 36°C/96°F, which protects your fish against cooking risk.

15W USB Small Heater for Fish Tank - USB power source offers flexibility in placement, and also won't electric shock your beloved fish! Convenient to power supply the heater with power adapter, or power bank(Power adapter or power bank is not included).