Be confident in your purchase we're an Authorized AutoAqua Dealer. How cool is that?!?!? Features: NEW! Controller programming circuitry for added system protection NEW! Improved sensor design for longer durability Engineered Specifically for Aquariums without Sumps Dual-Optical Sensor for Precise Operation with Secondary Failsafe Intelligent Pre-Programmed Algorithm Doubles as an Effective Surface Skimmer Media Chamber for Filtration Media Convenient Media Chamber for Filtration Media Plug-and-Play with All Parts Included Works in Complete Darkness Specifications: Power Adapter: Power Input: 100-240 VAC, 50-60 Hz Cable Length: 6 ft (180 cm) ATO DC Pump: Head: 8.2 ft (250 cm) Flow Rate: 74 gph (280 lph) Power: 4.8 W @ 12 VDC Cable Length: 6 ft (180 cm) Flexi Overflow Box: Dimensions: 3.94? x 2.17? x 6.30? (100 mm x 55 mm x 160 mm) Max. Volume of Media Chamber: 3.74 ? x 1.99 ? x 1.97 ? (95 mm x 50.5 mm x 50 mm) Max. Mounting Thickness: Sensor: 1/2 ? (12.7 mm) Flexi Overflow Box: 1/2 ? (12.7 mm) Length of Cable between Sensor and Controller: 6 ft (180 cm) AquaFX Clear Blaster Nano Filter Media (Free Sample), 90mL: Max. Mounting Thickness for Sensor: 1/2 ? (12.7 mm) Max. Mounting Thickness for Flexi Overflow Box: 1/2 ? (12.7 mm) Length of Cable between Sensor and Controller: 6 ft (180 cm) TheXP Aqua Sumpless 2 Aquarium Water Auto Top Off System is the first and only ATO designed specifically for aquariums without sumps. The combination of the sleek overflow box and the innovative dual-optical sensor ATO will help to keep your aquarium topped off and your water crystal clear. The overflow box easily mounts to any aquarium with its magnetic mount. It acts as a surface skimmer to rid your aquarium of undesirable oily surface skim and doubles as a media reactor for carbon, GFO or any media of your choice. XPAqua's proprietary dual-optical sensor packs two precise level sensors in one incredibly small package. In addition to keeping your water level constant, the two sensors also work in concert with the intelligent QST programming to help prevent overfilling. With so many features never seen before in ATO's, the XPAqua Sumpless ATO2 is the ultimate ATO solution for aquariums without sumps.