WHY CHOOSE SMART ATO LITE? Smart ATO Lite is a compact auto top off system for both nano and medium aquariums. Combined an ATO level sensor and a fail-safe sensor in one pack and integrated with QST (Quick Security Technology), which provides real-time protection against any failure and detects water empty, Smart ATO Lite offers you a safe and economical choice of auto top off systems. Features: //The smallest ATO system currently available //Suitable for nano / medium aquariums //Extremely easy to install with integrated magnetic mount //No moving parts to fail //Dual-optical level sensor in one pack provides dual protection //QST (Quick Security Technology) provides real-time failsafe protection against failure //LED light alert //Everything needed is included. Specifications: Power Input : 100-240 VAC, 50-60 Hz Cable Length of Power Adapter: 180 cm (6 ft) DC Pump : Head : 8.2 ft (250 cm) Flow Rate : 74 gph (280 lph) Max Mounting Thickness : 1/2 inch (12.7 mm) Power : 4.5 W @ DC 12 V Pump Cord Length : 6 ft (180 cm) Length of Cable between Sensor and Controller : 120 cm (4 ft)