1. Working voltage: DC 5V 2. Working current 7-12MA 3. One power indicator light, four water level indicator lights 4. Four water level output interfaces (low level 0V, high level 3.7V),for MCU IO 5. Four water level sensor interfaces (2P XH2.54) Note:1. Package does not contain probe (wire).2P Male XH2.54mm Pitch Wire Cable can be used as a probe,which can be prepared by yourself. 2. For safety, use an DC power supply with good isolation Application: for Arduiuo UNO MEGA2560 NANO IO for FPGA/CPLD ARM STM32 Home water tower automatic water supply system Aquarium Fish tank Water Changer System Fill the water tower automatically Automatic pumping from water tower Conductive liquid automatic control Automatic feeding system for poultry and livestock Farm automatic water supply system And other occasions that require automatic water supply and water exchange. Solenoid valve water pump motor automatic control The printing/appearance may vary from batch to batch, but it will not affect the use; the actual product may have color difference due to different light or display. Specification:with Pin/No Pin Colour:White Material:PCB Package Contents: 1 x DC 5V 4 Outputs Water Liquid Level Indicator Board Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.