Description: 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. Parameterï¼? Input Voltageï¼?90-250VAC Specification: 180mm x 140mm x 70mm Max Thickness of Tankï¼?12.5mm Power Adapterï¼?EU, Au, Us, UK Regulation Feature: Eco-friendly Customized: Customized