Premium Performance and Excellent Auto-Top-Off System The AutoAqua Smart ATO Lifter offers powerful performance and excellent auto-top-off functionality, with a silent AQUA Lifter Pump and a brand new ATO controller, ensuring accurate detection regularly and quantitatively. Smart ATO Lifter is also perfect for your compact aquarium with its clever shape and neat design. It features a sleek design, simple, user-friendly controls, rugged construction, and easy maintenance and installation. Built-in QST(Quick Security Technology) will give an audible and visual alarm for failure situations. Key Features: The optical eye is magnetically coupled with the magnet measuring only ¼" thick. It can be mounted to most clear, tinted, or painted surfaces up to ½” thick. The sensor operates in the daytime or in complete darkness, so it’s safe for use when hidden inside your aquarium stand or in the back chambers of an all-in-one aquarium. AQUA Lifter Pump is a replaceable Diaphragm Pump that adds water slowly to accurately reach the desired water level. Includes a built-in anti-siphon valve to safeguard against forward siphoning. The holder of the AQUA Lifter Pump can be hung on both rimless and rimmed aquariums. It can be mounted with a screw or nail on the aquarium cabinet/stand to reduce pump vibration. The silicon gasket is perfect for noise and vibration reduction. The device is marked with a water inlet and outlet symbol to prevent installation errors.