Be confident in your purchase we're an Authorized AutoAqua Dealer. How cool is that?!?!? Features: Power Input / Output : 100-240 VAC, 10 Amp Max. Power : 1100 W for 110 VAC / 2200 W for 220 VAC Skimmer Sensor : - Max. Mounting Thickness : 5/16 inch (8 mm) - Wet Side Magnet Size : 20 mm x 17 mm (Diameter x Thickness) Cable Length : 10 feet (300 cm) The AutoAqua Smart Aquarium Water Skimmer Security can detect skimmer cup full, shut off the skimmer and give an audible and visual alarm immediately to prevent catastrophe. No longer need to check your skimmer cup constantly! Smart Auto-Recovery function allows it turn on back after cleaning the collection cup. Users don't need to unplug the AC Switch and plug it back to reset the device. This small yet smart optical sensor not only detects skimmate level precisely but makes maintenance easily. Its magnetic sensor fits most skimmer cups and can be mounted at the desired level in a second without any tool.