Fangrui Product Details Scroll Unit Is A Rotary Encoder Expansion Unit In The Form Of A Scroll Wheel. It Integrates A 12-pulse Through-shaft Encoder + Button Input + Ws2812c Programmable Rgb Led. The Built-in Stm32f030 Microcontroller Integrates Encoder Pulse Signal Acquisition Firmware, Allowing Users To Directly Obtain Encoder Values Through I2c Reading Operations, Simplifying Complex Processes. It Is Suitable For Control Scenarios Such As Scale Value Control And Volume Adjustment. Colour:white Red Material:plastic Specifications: 1.based On Stm32 Microcontroller 2.ab Phase Output (12 Pulses Per Revolution) 3.built-in Button 4.multi-color Ws2812c Rgb Led Indicator 5.i2c Communication Interface Applications: 1.industrial Automation 2.smart Home 3.robotics 4.human-computer Interaction Due To Different Batches, There May Be Differences In Product Appearance And Printed Text, Which Will Not Affect Use Package Contents: 1 X Scroll Unit 1 X Hy2.0-4p Grove Cable(cable Color Random, Dont Accept The Specified Color) Only The Above