hygger Small Submersible Aquarium Heater 15W Mini Betta Fish Tank Heater with Thermostat for 1-2.5 Gallon Saltwater Freshwater

At-A-Glance Temperature Display — heater rod shows real time water temperature and indicator light. It will be red when heating, green light when the proper temperature has been reached.
External Knob Controller Memory Function — allows you quick set temperature without getting hands wet especially in winter, adjustable wide temperature range of 59°F to 93°F in 1-degree increments. Memories last setting when you unplug it to water change.
Out of Water Shut Off Protection — feature to ensure it doesn’t overheat and cause harm to your livestock. Turn off before it exceeds desired temperature. Shatterproof plastic guard protects fish/turtle from impact and making contact, easy to detach to cleaning
Great For Small, Shallow Tank — slim flat profile mini tank heater measures 4.3”x 1.8”x 0.9”, which is quiet space saving and easy to hide behind filter/wood/rock with two strong suction cups mount. Thanks to the flat design, it can be placed vertically or horizontally at gravel free aquarium bottom to heat up low water level turtle tank.