Bestgle Mini Aquarium Heater 5V/2A USB 15W Super Small Fish Tank Heater with Digital Display Thermostat, Thickened Quartz Glass Betta Tank Heater Turtle Heater for Tanks up to 1 Gallon

Small 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

Quartz Glass Material: The heating rod is made of 2mm thickened quartz glass, is resistant to explosion and corrosion, and protects fish waterlives from punching and scalding

LED Digital Display & External Temperature Controller: The LED display shows the water temperature in real-time. The external controller (64-93℉/18-34℃) lets you adjust the temperature without getting wet hands

Automatic Constant Temperature: The heater maintains the water temperature within 1°F accuracy. It automatically stops heating if the water temperature goes over 96°F (36°C) to protect

5V/2A USB Power Source: Use a 5V/2A power adapter or a 5V/2A power bank to fuel up the heater. (Please note the power adapter or power bank is not included)