Features: This aquariums water levels controller employs sensors technology to automatically monitor and adjust water levels, ensuring optimal conditions for plant and fish in your tanks. Featuring a compacts, light weight design and a patented drip systems, it delivers stable, uniform water flows without harming plant, making it ideal for various aquariums size. Aquarium enthusiasts and pet owners seeking simple maintenance for their fish tanks will appreciate this device's user friendly operations and reliability performances. Use it in homes or office aquariums to maintain consistent water levels during daily routines or vacations, enhancing the visual appeal of your setup effortlessly. Crafted from durability ABS materials, it includes safety features like dry run and overflows protecting, long terms use in any aquarium environment. Specifications: Dimension: 3×3.7cm/1.18×1.45in Component:ABS Package Includes: 2sets automatic water refill for fish tanks note: 1.Please allow 1-2cm errors due to manual measurement, making sure that you will not mind before order. 2.Due to the differences between different monitors, the picture may not reflect the actual color.