1. Automatic Temperature ControlThis mini aquarium heater effectively raises water temperature by 5-8°C, providing a stable and warm environment for your small fish or aquatic pets. It features rapid heating and automatic constant temperature maintenance, ensuring precise thermal regulation without constant monitoring. 2. Perfect for Small TanksDesigned specifically for nano and micro aquariums, this small heating rod is suitable for 0.5-2L water volumes. Its extremely compact design (approximately 7.8x1x1.3 cm / 3.1"x0.4"x0.5") allows for easy placement without occupying much space in your mini desktop tanks, betta bowls, or small planted setups. 3. Safety First DesignPrioritizing your aquatic pet's safety, this heater features multiple safety guards. The advanced heating parts is quick to generate warmth yet engineered to remain safe and stable, preventing overheating. The sturdy material construction prevents burns and withstands accidental drops. It is also designed to resist dry burning, offering an additional layer of protection. 4. sturdy Metal ConstructionCrafted from sturdy aluminum alloy, this mini heater is built to last. The robust metal casing provides excellent impact resistance and efficient heat transfer. It measures approximately 7.8x1x1.3 cm (3.1"x0.4"x0.5"), and the sleek black color seamlessly blends into any aquarium decor. 5. USB Powered ConvenienceFeaturing a standard USB 5V2A power input, this heater provides convenient and flexible powering options. The lengthy 98 cm / 38.6" power cord, equipped with a handy suction cup, enables easy and secure installation anywhere in your tank. Simply connect to a power bank, computer, or adapter for immediate use. --- Package list 1x heating rod