This module is composed of OLED IIC interface module and EC11 rotary encoder combined module, two It is not associated, just placed on a board, made into an integrated module, with additional return and Confirm the key, the key interface is also independent, you can choose to use according to the actual use. Integrated design, more simple and beautiful, convenient DIY. 1.3 Inch / 0.96 Inch OLED+EC11 rotary encoder OLED driver chip: SH1106/SSD1306 OLED interface: IC/IIC EC11: Plum handle, handle length 15mm,20 Pulse 20 positioning, 5 pin strap switch CON(KEY1): Confirms the key interface SDA: Data interface for OLED screen IIC communication SCL: Clock interface for OLED screen IIC communication PSH: key interface of EC11 TRA, TRB: phases A and B of EC11 BAK(KEY0): Returns the key GND: Power source VCC:3.3V power supply positive Colour:Photo Color Material:plastic Package Contents: 1 x display 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.