WHY CHOOSE SMART ATO MICRO ? Smart ATO micro is a super compact Auto Top Off system. With a unique penny-sized optical sensor, it has no moving parts that can fail. Magnetically-coupled sensor makes it so easy to adjust to the desired water level. This ATO is also integrated with QST (Quick Security Technology), which provides real-time fail safe protection against any failure and detects water empty. MODEL: SATO-120P Features: Smart ATO micro is the smallest ATO system currently available Suitable for nano / pico aquariums Extremely simple to install No moving parts to fail Optical level sensor with integrated magnetic mount QST (Quick Security Technology) provides real-time failsafe protection against failure Everything you need is included Includes: Smart Micro Controller x 1 Power Adapter x 1 DC Refill Pump x 1 Universal Tube Holder x 1 Siphon Break x 1 Tubing 6.5 ft (200 cm) x 1 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) Power Cord Length : 6 ft (180 cm) Length of Cable between Sensor and Controller : 120 cm (4 ft)