Features Built-in AD584 module for highest accuracy and stability, ensuring reliable performance. Single port output for 2.5V/5V/7.5V/10V reference voltages, providing versatile use for various applications. MCU controlled 4-channel voltage output with LED indicator and single-key , offering convenient control and monitoring. Stable performance and easy installation, making it an efficient and reliable voltage reference module. construction using high-quality PCB board and acrylic material, ensuring long-lasting use. Specification: Item Type: Voltage Reference Module Material: PCB Board+Acrylic Model: AD584 Color: Yellow Measuring Range: 2.5V, 5V, 7.5V, 10V Power Supply: Polymer 503035 500mAh x 1 (Built-In Battery) How to Use: Get the product, turn on the power button, the indicator shows which range, the module test is in which range. Press the middle button of the module again to switch the range. The user can take the test line and insert it into the positive and negative holes for measurement. Package List: 1 x Voltage Reference Module Package List 1 x Voltage Reference Module