Features Exceptional Accuracy and Stability: Features the built-in AD584KH for unparalleled precision in voltage reference applications, ensuring reliable and consistent performance Versatile 4-Channel Output: Equipped with an MCU switch that allows easy selection among 4 different reference voltages, complete with LED indicators for clear visibility of selected output Convenient Single-Button Operation: Simplifies voltage selection with a user-friendly single-button design, making it ideal for quick adjustments in various projects Portable and Rechargeable Design: Easily transportable with a DC 5V charging capability, complemented by a charge indicator for hassle-free monitoring of battery status Durable Transparent Case: Protects the module from damage while providing a clear view of the inner components, allowing for easy monitoring and maintenance Features: 1、Built-in AD584kh, highest accuracy and stability 2、The MCU switch 4-channel reference voltage output with LED indicators 3、Single-button switch reference voltage 4、 Easy to carry, can be charge by DC 5V,with charge indicator 5、Transparent case can protect module from damage and provide clear view Specification: Features: Built-in AD584kh, highest accuracy and stability. The MCU switch 4-channel reference voltage output with LED indicators. Single-button switch reference voltage. Easy to carry, can be charge by DC 5V, with charge indicator. Transparent case can protect module from damage and provide clear view. Specification: Reference Voltage: 2.5V, 7.5V, 5V, 10V Banana Socket Output: 4mm Weight: 92g(approx.) Package Includes: 1 x Voltage Reference Module Note: 1, Please check input battery charging voltage and do not charge with more than 5.5 volts DC. Please charge with a USB adapter. 2, Battery is NOT included. Package List