1. Accurate Temperature Monitoring: The backside features a temperature sensor; press and hold for 3 seconds to switch temperature units. Monitoring range is from 0℉ to 99℉. Accuracy: ±0.9°F. 2. Suitable for Glass Tanks: Specifically designed for glass tanks with a thickness of less than 1/2 inch, featuring strong magnetic force for secure attachment. Recommended for use in 1-30 gallon fish tanks, best for betta tanks and small aquariums. 3. Sturdy Magnetic Adhesion: Powerful magnetic force ensures the brush stays firmly attached to the glass of the fish tank, preventing it from floating away. 4. Efficient Cleaning: The powerful magnetism effectively cleans every part of the aquarium, scrubbing both the inside and outside of the glass to ensure thorough cleanliness. 5. Convenient and Practical: Compact in design and easy to operate, it can float on the water surface without affecting the activities of aquarium organisms, occupying minimal space. Specifically designed for glass tanks; not suitable for acrylic or plastic aquariums.