Saltwater Aquarium All-in-one Auto Top Off Refilling System with Dual Optical Sensor for Both Reef and Fresh Tank

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• This smart automatic water filler for fish tanks maintains a stable water level in your aquarium. It’s ideal for trips and vacations, keeping the water level within a safe range at all times. Simply press the power button to operate—extremely user-friendly.
• This all-in-one automatic aquarium water filler eliminates complicated wiring and tedious water pipe installation. Simply hang it directly onto your fish tank to start using it effortlessly. It delivers greater convenience and a neater overall look for your aquarium, free from messy tubes and loose wires.
• This aquarium ATO system controls the upper and lower water level within 0.25 inches, and is applicable to aquariums with water surface fluctuation less than 0.3 inches. Due to reserved installation clearance, it only fits rimless fish tanks. Please note this point. It cannot be installed or function properly if the water surges excessively or the aquarium comes with a frame.
• This aquarium ATO auto top-off system is USB-powered. Its low power design delivers enhanced electrical safety, so you can leave your home for extended periods without worrying about power hazards. Installation is incredibly easy—simply hang the unit on your fish tank and it’s ready to go. Both adults and kids can operate it with total ease.
• This automatic aquarium water refiller is equipped with a water level sensing float. It intelligently detects dropping water levels and initiates automatic water replenishment once the water line goes down. With a fast water filling rate, it reliably maintains the ideal water level for your fish tank.