This module is designed for wide voltage, with a power supply range of DC 3-5.5V. There are two power supply methods. USB cable power supply or self wiring (with interface reserved) The module should be connected to the pressure sensor first, and then powered on for use. First time with After connecting the pressure sensor, calibration is required. The board has peeling and calibration features Waiting for functions. The parameters have power-off saving and do not require recalibration for use. Using a 4-digit digital display, it can display up to 9999g. Can handle commonly used pressures of 5KG or 10KG Sensors with a range of 5kg generally have an accuracy fluctuation of around 19. If the fluctuation is large, it may be caused by unstable power supply. Please try replacing the power supply and calibrate it after the first connection, The module should be connected to the HX711 pressure sensor first, and then powered on for use. After connecting to the HX711 pressure sensor for the first time, calibration is required. Product Name: Electronic Scale Display Module Power supply range: DC 3-5.5V Power supply method: USB cable power supply or self wiring (with interface reserved) Power Supply DC Stand: Model DC-002 Product function: Peel off, calibrate Range: (MAX) 9999g Colour:As Shown Material:PCB Package Contents: 2 x Weighing electronic scale module 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.