Type: Aquariums & Accessories Material: Plastic Feature: Eco-Friendly Place of Origin: China Product name: Auto Top off System Specification: 180mm x 140mm x 70mm Hose Length: 1.8 Meters Max Thickness of Tank: 12.5mm Input Voltage: 90-250VAC Power Adapter: EU,Au,Us,UK Regulation Integrated Sensor: Optical Level Sensor Warranty: 1 Year Service: OEM and ODM Customized: Customized The sensor is a mini optical infrared sensor for extremely precise regulation. It checks/fills frequently, the water level Max to Min is no more than 5mm, meaning a lesser amount of water fluctuation; where is suitable for small tanks.